Polymer Science and Technology Series – serie

The development and use of medical and dental materials are highly interdisciplinary endeavors which require expertise in chemistry, materials science, medicine and/or dentistry, mechanics and design engineering. The Symposium upon which this treatise is based was organized to bring members from these communities together to explore problems of mutual interest. The biomaterials which are used in medical or dental prostheses must not only exhibit structural stability and provide the desired function, but they must also perform over extended periods of time in the environment of the body. The latter is a very stringent requirement. The oral and other physiological environments are designed by nature to break down many organic substances. Also of importance is the requirement that materials used in the prosthesis not have a deleterious effect on body tissues. Most foreign (to the body) substances are somewhat toxic to human tissues; in fact, few factors are more limiting in the medical prosthesis field than the biocompatibility problem. Some of these problems and the attempts to solve them are discussed in this volume.

This book originated in the Proceedings of the Second Symposium on Polymeric Liquid Crystals held by the Division of Polymer Chemistry in the framework of the 1983 Fall Meeting of the American Chemical Society. At the First Symposium in 1977, the literature in this field could be encompassed in a single volume. To­ day, that is no longer possible. The field of Polymeric Liquid Crystals grew, and continues to grow, at a very rapid pace. At present, we know of every major mesophase in its polymeric form and of polymeric glasses, elastomers and fluids in their liquid crystalline form. Every year, new polymeric mesophases are being discovered. The aim of this book is to go beyond a compilation of papers presented at the 1983 ACS Fall Meeting. It is conceived as a learning tool for the benefit of the sci­ entist interested in Polymeric Liquid Crystals. The book is divided into three sections. The first section contains articles discussing synthetic, physico­ chemical, structural and rheological aspects of Polymeric Liquid Crystals in their generality. A chapter on methods currently used in this field is also included. There are also chapters on theoretical and classification aspects of PLCs. These self-contained tutorial chapters provide an introduction to this field as well as to the specific papers given in the book. They provide an exhaustive cover­ age of literature on the subject from its inception to the present.

This book is an extended version of the proceedings of the Symposium on Polymer Composites, Interfaces, which was held under the auspices of the Division of Polymer Chemistry, American Chemical Society (ACS) during the annual ACS meeting in Seattle, March, 1983. The importance of the interface in composite materials has been recognized since the inception of modern composite technology. Specifically, silane coupling agents were developed for glass fiber reinforced compOSites at a very early date. Ever since then the diversity of composite materials and the development of various surface treatment methods have led to the establishment of an "interface art." A trial-and-error approach has dominated the interfacial aspects of composite technology until very recently. With the advent of modern analytical techniques for surface characterization, it became possible to study detailed surface and interface structures. It was hoped that this symposium would catalyze such a fundamental and scientific approach in composite studies. For this reason, the symposium was structured to verify the influence of interfacial structures on the mechanical and physical performance of composites and to improve our knowledge of the microstructure of composite interfaces. As the word ·composite" indicates, interdisciplinary interaction is indispensable for proper understanding of multiphase systems.

The art of using chemical agents for medication dates back into antiquity, although most of the earliest examples used plants, herbs, and other natural materials. The old Egyptian medical papyri, which date from before 1400 B. C. , contain dozens of examples of such medicinal plants and animal extracts. In the Old Testament of the Bible, we can find references to using oil to soften the skin and sores (Isaiah 1:6), the use of tree leaves for medicine (Ezekiel 47:12) and various medical balms (Jeremiah 8:22). Not all these recipes were effective in curing the ailments for which they were used and sometimes the treatment was worse than the disease. Nevertheless, the art of using chemical derived agents for medicines continued to develop and received great impetus during the present century with the rise of synthetic organic chemistry. One of the most vexing problems has always been to achieve specifici­ ty with the medications. While some medical agents do indeed possess a relatively high degree of specificity, most agents are far more systemic than would be desired. Much of the research efforts to correct this deficiency has centered on modifying the chemical agents themselves. Unfortunately, there are severe limitations in this approach since minor modifications often drastically affect the therapeutic activity and can even render the drug completely ineffective, or worse.

Without additives, there could be no plastics industry. Additives enable us to achieve acceptable processing behaviour, performance targets and useful product lifetimes. They also promote safety by improving fire resistance and reducing smoke output. Arranged alphabetically for easy access, this volume presents articles on additives. Experts in additive and polymer science from several countries and from many international companies explain the recent changes in additive technology, especially blowing agents for foams, pigments and flame retardants, resulting from environmental concerns and legislative change. The book deals with novel additives (scorch inhibitors, compatibilizers, and surface-modified particulates) as well as the established varieties (antioxidants, biocides, antistatic agents, nucleating agents, fillers, fibres, impact modifiers, and plasticizers) and many others. There are introductory contributions dealing with the analysis of additives and with the principles of mixing technology. Interactions between additives are considered.

This volume provides a fully cross-referenced and concisely presented overview of the most important aspects of the mechanical properties of polymers. Short articles provide a quick reference guide for the busy professional as well as a resource for postgraduate and undergraduate students. Coverage includes both background theory and test methods as well as comprehensive summaries of the areas of adiabatic shear, high rate behaviour, anelastic deformation, friction and wear, computer modelling, and structure-property relationships. Written by experienced scientists, each short article introduces a particular aspect of polymer properties and is accompanied by a list of references where in-depth information may be found.

This volume reviews the present state of knowledge on the manufacturing, processing and applications of neat, modified, filled and reinforced polypropylenes at the end of the 20th century. An international group of experts surveys all important scientific and technical aspects of polypropylene (PP) in a concise manner. The book represents an updated and comprehensive report on the synthesis, processing, testing and applications of PP and related systems (modified, filled, reinforced). Each key aspect is the subject of an article for non-specialists. The articles are grouped in alphabetical format which should allow the reader to find the information needed quickly. The easy retrieval of the information is supported by a comprehensive reference guide based on key-words.

Many of the trace amines-more correctly called biogenic amines- have been known for decades, but because of their tiny concentra- tions (0. 01-100 ng/g) in brain, it was only after the development of sophisticated analytical techniques (such as mass spectrometry) that they could be identified and quantitated in nervous tissue. There are now more than 20 of them and most are related to the catecholamines and 5-hydroxytryptamine both structurally and metabolically. Their pharmacological and physiological properties make them prime candidates for a transmitter or neuromodulator role and many of them elicit profound behavioral syndromes after injection--one of them, phenylethylamine, has even been referred to as nature's amphetamine. In the clinical sphere several have been shown to be involved in: Parkinsonism, schizophrenia, depression, agoraphobia, aggression, hyperkinesis, migraine, hypertensive crises, hypertyrosinemia, he- patic encephalopathy, epilepsy, and cystic fibrosis.Thus the research reported here on these intriguing "new" substances will be of great interest to psychiatrists, neurologists, biochemists, pharmacologists, physiologists, psychologists, behaviorists and indeed to all those working in the neurosciences and related fields today. ACKNOWLEDGMENTS This book is based on the proceedings of Trace Amines and the Neurosciences, a meeting held at the University of Alberta, Edmonton, July 19-21, 1983. This meeting was organized as a Satellite Meeting of the Ninth Meeting of the International Society for Neurochemistry, held in Vancouver, July 10-15, 1983. International organizers of the satellite meeting were Drs. A. A. Boulton (Saskatoon), W. G. Dewhurst (Edmonton), G. B. Baker (Edmonton), and M. Sandler (London).

The conference "Nonlinear Optics and Optical Computing" was held May 11-19, 1988 in Erice, Sicily. This was the 13th conference organized by the International School of Quantum Electronics, under the auspices of the "Ettore Majorana" Center for Scientific Culture. This volume contains both the invited and contributed papers presented at the conference, providing tutorial background, the latest research results, and future directions for the devices, structures and architectures of optical computing. The invention of the transistor and the integrated circuit were followed by an explosion of application as ever faster and more complex microelectronics chips became available. The information revolution occa­ sioned by digital computers and optical communications is now reaching the limits of silicon semiconductor technology, but the demand for faster com­ putation is still accelerating. The fundamental limitations of information processing today derive from the performance and cost of three technical factors: speed, density, and software. Optical computation offers the potential for improvements in all three of these critical areas: Speed is provided by the transmission of impulses at optical veloc­ ities, without the delays caused by parasitic capacitance in the case of conventional electrical interconnects. Speed can also be achieved through the massive parallelism characteristic of many optical computing architec­ tures; Density can be provided in optical computers in two ways: by high spatial resolution, on the order of wavelengths of light, and by computa­ tion or interconnection in three dimensions.

New technologies constantly generate new demands for exotic materials to be used in severe environments. The rapid developments of aerospace industries during the last two decades have required new materials to survive extreme high and low temperatures and various radiations. The exploration of new energy sources, e.g., solar and geothermal, has led us to develop new solar collectors and geothermal devices. Even the search for new oils has demanded that we study the corrosive environment of oil fields. In the telecommunication industries, optical fibers have been adopted broadly to replace metallic conductors. However, none of the optical fibers can survive abrasion or corrosion without the application of a coating material. For microelectronics, protection in terms of coatings and encapsulants is deemed necessary to prevent corrosion. One of the major causes of corrosion has been shown to be water which appears to be abundant in our earthly environments. Water can attack the bulk adhesive (or sealant), the interface, or the adherend. Water can also cause delamination of coating film, and it is definitely the major ingredient in causing cathodic or anodic corrosion. Thus, water becomes the major obstacle in solving durability problems of various materials in harsh environments.

Polymers and polymer based composites have gained increasingly larger applications in medicine and surgery. Presently, most biomaterials applications rely on industrial substances that were initially developed by industry for non-medical purposes. Moreover, polymers have been often used regardless of their peculiar characteristics which can be viceversa and very attractive for some specific applications. In the past years we have assisted to a significative and faster development of polymer science as well as of medicine and surgery. The assistance of computer aided apparatus, the use of always more advanced instruments, the larger interest of the academic and industrial world, bring continuously new contributions to the research on biomedical and parmaceutical use of polymers. The need of a forum where these specific researchs can be presented and discussed, and the success of the 1st Conference on Polymers in Medicine, held in Porto Cervo in 1982, have encouraged the Editors to plana periodical meeting, focused on polymers and composites, to be held every odd year. This book contains papers selected by an International Scientific Committee among those presented at the 2nd International Conference on Polymers in Medicine, Biomedical and Pharmaceutical Applications, held in Capri, Italy, 3-7 June, 1985. In addition to contributed papers, several Authors were invited to present the "state of the art" as well as their personal contibution on specific key arguments. The level of all contributions was high, the participation well qualified, and the meeting interesting and hopefully pleasant.

"Polymer Science and Engineering: Challenges, Needs, and Opportunities," a report issued in 1981 by the National Research Council's ad hoc Panel on Polymer Science and Engineering gives ample support for the urgent need of increased commitment to basic studies on polymers. Needs and opportunities, mentioned in the Panel's list, included polymerization methods, specialty polymers, high performance materials, and in situ (reaction injection molding) polymerization for direct conversion of monomers/oligomers to useful shapes. Clearly, in all these and several other areas, advances in polymer synthesis are needed. Whether one takes a look at the commodity or specialty polymers area or considers areas of growing needs, such as polymers for the automotive, aerospace, electronics, communications, separations, packaging, biomedical, etc., advances in polymer synthesis are needed. Polymeric materials, as they are constantly being modified and improved, fine-tuned for current and additional needs, and more readily adopted by industry and the public, will have a vastly expanding influence on everyday life. However, lack of long-term support of meaningful size for basic research on all facets of polymer chemistry and engineering, with particular emphasis on making needed advances in polymer synthesis, could well stunt the growth of high techn.ology in our country. Expanding this thought, lack of attention to basic research on polymer synthesis could help foster or insure that we won't have materials with performance profiles to meet requirements of emerging technologies and national needs, in a reasonably economic and timely fashion.

The II international workshop on "Data Analysis in Astronomy" was intended to provide an overview on the state of the art and the trend in data analy­ sis and image processing in the context of their applications in Astronomy. The need for the organization of a second workshop in this subject derived from the steady. growing and development in the field and from the increasing cross-interaction between methods, technology and applications in Astronomy. The book is organized in four main sections: - Data Analysis Methodologies - Data Handling and Systems dedicated to Large Experiments - Parallel Processing - New Developments The topics which have been selected cover some of the main fields in data analysis in Astronomy. Methods that provide a major contribution to the physical interpretation of the data have been considered. Attention has been devoted to the description of the data analysis and handling organization in very large experiments. A review of the current major satellite and ground based experiments has been included. At the end of the book the following 'Panel Discussions' are included: - Data Analysis Trend in Optical and Radio Astronomy - Data Analysis Trend in X and Gamma Astronomy - Problems and Solutions in the Design of Very Large Experiments - Trend on Parallel Processing Algorithms These contributions in a sense summarize the 'live' reaction of the audience to the various topics.

Since the first symposium on Recent Advances in Adhesion, held September, 1971 in Washington, D. C. , this Division of the American Chemical Society has continuously sponsored several symposia on adhesion and adhesives. The chemists have gradually realized the importance of adhesion in various fields of science and technology. During these years, the science of adhesion has steadily grown along with progress in surface science and fracture mechanics. Moreover, new adhesives have been invented and applied in actual structures, for example, structural and aerospace adhesives. In response to socio-economic demands, new forms of adhesives have been introduced to combat the problems of pollution and to promote energy-conservation. The developments of hot-melt adhesives, waterborne adhesives, and radiation-curable adhesives are vivid examples of successes in solving some of the problems. As chemists, our hatural desire is to understand how those new adhesives and new forms of adhesives are made. Thus, we are interested in learning about the chemistry of adhesives so that we may create new generations of materials to satisfy future needs. It was based on this common interest that w~ set forth to org'anize this Symposium on Recent Developments in Adhesive Chemistry. It was held from March 21 through 23, 1983 in the Westin Hotel, Seattle, Washington. The Symposium was very well attended. As a matter of fact, for the first two sessions, we had to move from the smaller Mt. St.

The search for flavored particles is one of the most;interesting topics in high energy physics. Many experimental groups are working on this subject, but the solution to many of the problems are still open. Therefore it seemed very useful that people interested in these problems can probe then in a discussion. This is the aim of this Europhysics Study Conference, which has been organized both as a conference and a workshop. The present experimental knowledge on branching ratios, life- times, cross sections and production mechanisms of flavored parti- cles has been presented in general talks and discussed in the morn- ing sessions, as well as the bases of the theoretical ideas and pre- dictions. The experimental methods: visual detectors, live targets, high resolution vertex detectors, special triggers of search on fla- vored particles, have been treated in the afternoon panels. These proceedings contain the talks and panel discussions with the exception of a few small contributions to the panels and talks by C. Baltay ("Search for charm and new flavors with bubble cham- bers"), G. Alteralle ("Lifetime of charm and new flavors"), P.Monacelli ("Results on charm production from a CERN Beam Dump exper- iment"), A. Capone ("Experimental study of same-sign dimunon events produced in neutrino and anti-neutrino beams").

Ever since the beginning of the plastics and rubber industry, it was realized that useful products could be produced only if cer­ tain additives were incorporated into polymers. With the help of these additives, when physically dispersed in a polymer matrix, it has been possible to improve stability against thermal, oxidative, UV, hydrolytic and biological degradation, mechanical properties, flammability, cost, and processibility of plastics. The enormous growth of the volume of plastics consumed by modern society, and new application areas for plastics, have created a demand for new, better additives and better understanding of their functions in polymer systems. As a result of these trends there is a need for sharing of information on progress achieved in the area of polymer additives among engineers and scientists of the plastics industry and academia. This book is based on expanded and updated papers originally presented at the International Symposium on Polymer Additives, which was held in Las Vegas, Nevada, and was sponsored by the American Chemical Society, Division of Polymeric Materials Science and Engi­ neering. The book is divided into five parts which cover advances in various areas of polymer additives. The first part is devoted to the progress in understanding of UV degradation and stabilization of various polymers. Oxidation degradation and stabilization of plastic materials is covered in the second part. New developments in the stabilization of PVC are presented in the third part.

Many of the trace amines-more correctly called biogenic amines- have been known for decades, but because of their tiny concentra- tions (0. 01-100 ng/g) in brain, it was only after the development of sophisticated analytical techniques (such as mass spectrometry) that they could be identified and quantitated in nervous tissue. There are now more than 20 of them and most are related to the catecholamines and 5-hydroxytryptamine both structurally and metabolically. Their pharmacological and physiological properties make them prime candidates for a transmitter or neuromodulator role and many of them elicit profound behavioral syndromes after injection--one of them, phenylethylamine, has even been referred to as nature's amphetamine. In the clinical sphere several have been shown to be involved in: Parkinsonism, schizophrenia, depression, agoraphobia, aggression, hyperkinesis, migraine, hypertensive crises, hypertyrosinemia, he- patic encephalopathy, epilepsy, and cystic fibrosis.Thus the research reported here on these intriguing "new" substances will be of great interest to psychiatrists, neurologists, biochemists, pharmacologists, physiologists, psychologists, behaviorists and indeed to all those working in the neurosciences and related fields today. ACKNOWLEDGMENTS This book is based on the proceedings of Trace Amines and the Neurosciences, a meeting held at the University of Alberta, Edmonton, July 19-21, 1983. This meeting was organized as a Satellite Meeting of the Ninth Meeting of the International Society for Neurochemistry, held in Vancouver, July 10-15, 1983. International organizers of the satellite meeting were Drs. A. A. Boulton (Saskatoon), W. G. Dewhurst (Edmonton), G. B. Baker (Edmonton), and M. Sandler (London).

Honolulu is a most beautiful place, suitable for all occa­ sions. Its choice as the meeting site for the first Joint Chemical Congress between the American Chemical Society and the Chemical Society of Japan was praised by scientists from both sides. During this Congress, the International Conference on Adhesion and Adsorption of Polymers was held at the Hyatt Regency Hotel between April 2 and 5, 1979. We had speakers from ten nations presenting over forty papers related to the subject matter. It was a memorable event. Unlike our two previous adhesion symposia held in 1971 and 1975, this was the first time in the same conference that we discussed both adhesion and adsorption of polymers simultaneously. These two important phenomena are not only inter-related, but also equally important in adhesive technology as well as biochemical processes. The papers presented to this Conference deal with these two phenomena from both fundamental and practical viewpoints. Furthermore, with the advance of new surface analytical techniques, the actual, microscopic happenings at the interfaces can be pin­ pointed. Thus, characterization of interface became one of the major focuses of this Conference. As a result, a broad coverage of the subject matter includes statistical thermodynamics, surface physics, surface analysis, fracture mechanics, viscoelasticity, failure analysis, surface modification, adsorption kinetics, bio­ polymer adsorption, etc. Thanks to the diligence of our contri­ butors, we are now able to publish the final papers in these two volumes.

This book is a record of a symposium, "Ultrafiltration Membranes and Applications," which was held at the l78th National Meeting of the American Chemical Society in Washington, D.C., September 11-13, 1979. In organlzlng these sessions, I hoped to provide a comprehensive survey of the current state of ultrafiltration theory, the most recent advances in membrane technology, and a thorough treatment of existing applications and future directions for ultrafiltration. For me, the symposium was an outstanding success. It was a truly international forum with stimulating presentations and an enthusiastic audience. I hope that some of this spirit has spilled over into this volume, which is intended to reach a much wider audience. I am indebted to the Division of Colloid and Surface Chemistry of the American Chemical Society for their sponsorship. ANTHONY R. COOPER Palo Alto, California }larch, 1980 vii CONTENTS PART I. FUNDMfENTALS Fifteen Years of Ultrafiltration: Problems and Future Promises of an Adolescent Technology . . 1 Alan S. Michaels Production, Specification, and Some Transport Characteristics of Cellulose Acetate Ultrafil- tration Membranes for Aqueous Feed Solutions 21 S.Sourirajan, Takeshi Matsuura Fu-Hung Hsieh and Gary R. Gildert Chemical and Morphological Effects of Solute Diffusion Through Block Copolymer Membranes 45 Yatin B. Thakore, Dien-Feng Shieh and Donald J. Lyman Practical Aspects in the Development of a Polymer Matrix for Ultrafiltration. 57 Israel Cabasso Permeability Parameters of a Novel Polyamide Membrane...* ...

Those who recognize that our modern life style is dependent, to a large extent, on the use of organic polymers as thermal and elec­ trical insulators, may be surprised to learn that specific plastics may also be used as conductors of electricity. In addition to demon­ strating the versatility of polymers, this use as conductors will lead to developments which were not possible with other available materials of construction. This is a new field which is growing rapidly because of intensive research and developmental efforts by many different industrial, governmental and university investigators. Many of these researchers reported advances in this art at a symposium on conductive polymers sponsored by the American Chemical Society's Division of Organic Coatings and Plastics Chemistry held at the Second Chemical Congress of the North American Continent at Las Vegas, in August 1980. The proceedings of this timely symposium are presented in this book. The editor wishes to take this opportunity to express his grati­ tude to the authors who contributed to this book and to the ACS Organic Coatings and Plastics Division for sponsoring this effort. Raymond B. Seymour Department of Polymer Science University of Southern Mississippi Hattiesburg, MS 39401 v CONTENTS 1 New Horizons in Conductive Polymers Raymond B. Seymour Synthesis and Characterization of Conductive 7 Palladium Containing Polyimide Films • T.L. Wohlford. J. Schaff. L.T. Taylor.

This volume is a eoLleetion of manuseripts based on presenta- tions at a symposium "Polymerie Separation Media" organized for the Seeond Chemieal Congress of the North Ameriean Continent held in Las Vegas, August 24-29, 1980. The symposium was organized to bring together researehers in the expanding field of separations based on polymerie media. A diverse eross-seetion of re.seareh areas were presented, whieh were linked by the aetive separation agent being a polymerie material. I would like to thank the authors for their endeavours and the audienee for their partieipation, espeeially in light of the late change of venue for this meeting. Finally I am indebted to the Division of Polymer Chemistry Ine. of the Ameriean Chemieal Soeiety for their sponsorship. Anthony R. Cooper, Ph.D., FRSC Palo Alto, California July 1981 v CONTENTS DEDICATION TO BAREND H. J. HOFSTEE ...1 PART I TRANSPORT IN POLYMERIC MEDIA Some Condiserations Regarding the Hyperfi1teration of Organic Liquids. 7 I. J. Bass and P. Meares Measurement of Transport Interaction in Membranes ...19 ...K. S. Spiegier, T. S. Brun and A. Berg Free Vo1ume Estimates in Crysta11ine and Fi11ed Polymers ...21 H. L. Frisch and A. I.Kreituss Diffusion Coefficients of Po1ystyrenes in Porous Gels From Mass Transfer Dispersion in Gel Permeation Chromatography ...27 ...

For there is hope of a tree, If it be cut down, That it will sprout again And that the tender branch Thereof will not cease. Job XIV (7) Mankind has been blessed with a multitude of resources. In the beginning he utilized almost soley replenishable items such as vegetation and animal protein, for both nourishment and shelter. Gradually, such metals as copper and iron were developed and replaced wood as a material of construction. Cement and glass, although more plentiful than other minerals, also replaced the use of growing sub­ stances. Coal and oil became the primary sources of heat and power. Closer to the focus of this book, petroleum products began to replace the vegetable oils, tannin, wool, cotton, leather, silk, rubber, etc. in a host of applications. Surely, it was argued, the new materials did the job better and cheaper. What they didn't say is that soon we would run out of oil. In any case, research on growing natural products, now called renewable resources, slowed, and these industries sought only to maintain their status quo. The 20th Century saw an unprecedented emphasis and dependence on nonrenewable resources as energy sources (petroleum, coal, ura­ nium) and the fabric of technology (drugs, clothing, shelter, tires, computer parts). The predawn of the 21st Century brings a reali­ zation that a cyclic shift back towards the use of renewable re­ sources for technological application is in order.

Edwin J. Vandenberg, a long time researcher at the Research Center of Hercules Incorporated, was the 1981 winner of the American Chemical Society Award in Polymer Chemistry, sponsored by the Witco Chemical Corp. Following is the citation of the accomplishments which led to this award. "In recognition of his pioneering research that advanced polymer science and that led to the discovery and development of isotactic polypropylene, epichlorohydrin and propylene oxide elastomers, new polymerization catalysts, and the hydrogen method of controlling molecular weights of Ziegler polyolefins." It was my pleasure to arrange a symposium to celebrate this award at the Atlanta Meeting of the American Chemical Society on March 30, 1981. In considering the broad range of Vandenberg's contributions to polymer chemistry, it was decided to choose the subject of "Coordination Polymerization" for the symposium. This area is both one to which Vandenberg has made major contributions and one of great industrial and scientific interest. Since Vandenberg has been involved in coordination polymerization in both ring-opening and a-olefin type polymerizations, both were covered in the symposium, whose program follows. 1. "The Polymerization of 1,2-Epoxides Catalyzed by the Condensation Products of Metal-Containing Compounds with Alkylphosphates", T. Nakata, Research Laboratories, Osaka Soda Co., Ltd., 9 Otakasu-cho, Amagasaki City, Hyogo Pref. 660, Japan.

The sheer volume of topics which could have been included under our general title prompted us to make some rather arbitrary decisions about content. Modification by irradiation is not included because the activity in this area is being treated elsewhere. We have chosen to emphasize chemical routes to modification and have striven to pre- sent as balanced a representation of current activity as time and page count permit. Industrial applications, both real and potential, are included. Where appropriate, we have encouraged the contributors to include review material to help provide the reader with adequate context. The initial chapter is a review from a historical perspective of polymer modification and contains an extensive bibliography.The remainder of the book is divided into four general areas: Reactions and Preparation of Copolymers Reactions and Preparation of Block and Graft Copolymers Modification Through Condensation Reactions Applications The chemical modification of homopolymers such as polyvinylchlo- ride, polyethylene, poly(chloroalkylene sulfides), polysulfones, poly- chloromethylstyrene, polyisobutylene, polysodium acrylate, polyvinyl alcohol, polyvinyl chloroformate, sulfonated polystyrene; block and graft copolymers such as poly(styrene-block-ethylene-co-butylene- block-styrene), poly(I,4-polybutadiene-block ethylene oxide), star chlorine-telechelic polyisobutylene, poly(isobutylene-co-2,3-dimethyl- 1,3-butadiene), poly(styrene-co-N-butylmethacrylate); cellulose, dex- tran and inulin, is described.

The first ACS Adhesion Symposium was held in Washington, D.C., September 1971. During the four years since that meeting, much interest in adhesion has been generated among six divisions of the American Chemical Society. Then, in 1974, the Macromolecular Secretariat appointed me to work closely with the six Session chairmen in organizing this Symposium on Science and Technology of Adhesion. Needless to say, the success of the Symposium which took place between April 7 and 10, 1975 in Philadelphia, Pa., is due to their excellent cooperation and the enthusiastic response of con­ tributors. As originally planned, each division was responsible for one session, and most of the papers, including several late con­ tributions, are published in these two volumes of proceedings. During the Symposium, we held a banquet in honor of Professor Herman Mark in celebration of his eightieth birthday. His Plenary Lecture and the Symposium Address by Professor Murray Goodman are published in full at the beginning of the first volume. I thank Professors Mark and Goodman for their excellent presentations on this memorable occasion.

Honolulu is a most beautiful place, suitable for all occa­ sions. Its choice as the meeting site for the first Joint Chemical Congress between the American Chemical SOCiety and the Chemical Society of Japan was praised by scientists from both sides. During this Congress, the International Conference on Adhesion and Adsorption of Polymers was held at the Hyatt Regency Hotel between April 2 and 5, 1979. We had speakers from ten nations presenting over forty papers related to the subject matter. It was a memorable event. Unlike our two previous adhesion symposia held in 1971 and 1975, this was the first time in the same conference that we discussed both adhesion and adsorption of polymers simultaneously. These two important phenomena are not only inter-related, but also equally important in adhesive technology as well as biochemical processes. The papers presented to this Conference deal with these two phenomena from both fundamental and practical viewpoints. Furthermore, with the advance of new surface analytical techniques, the actual, microscopic happenings at the interfaces can be pin­ pointed. Thus, characterization of interface became one of the major focuses of this Conference. As a result, a broad coverage of the subject matter includes statistical thermodynamics, surface physics, surface analysis, fracture mechaniCS, viscoelasticity, failure analysis, surface modification, adsorption kinetics, bio­ polymer adsorption, etc. Thanks to the diligence of our contri­ butors, we are now able to publish the final papers in these two volumes.

Polymers and polymer composites have been increasinqly used in place of metals for various industries; namely, aerospace, automotive, bio-medical, computer, electrophotography, fiber, and rubber tire. Thus, an understanding of the interactions between polymers and between a polymer and a rigid counterface can enhance the applications of polymers under various environments. In meet­ ing this need, polymer tribology has evolved to deal with friction, lubrication and wear of polymeric materials and to answer some of the problems related to polymer-polymer interactions or oolymer­ rigid body interactions. The purpose of this first International Symposium was to introduce advances in studies of polymer friction and wear, especially in Britain and the U.S.S.R. Most earlier studies of the Fifties were stimulated by the growth of rubber tire industries. Continuous research through the Sixties has broadened the base to include other polymers such as nylon, polyolefins, and poly tetra­ fluoroethylene, or PTFE. However, much of this work was published in engineering or physics journals and rarely in chemistry journals; presumably, the latter have always considered the work to be too applied or too irrelevant. Not until recent years have chemists started to discover words such as tribo-chemistry or mechano­ chemistry and gradually become aware of an indispensable role in this field of polymer tribology. Thus, we were hoping to bring the technology up to date during this SympOSium, especially to the majority of participants, polymer chemists by training.

The first ACS Adhesion Symposium was held in Washington, D.C., September 1971. During the four years since that meeting, much interest in adhesion has been generated among six divisions of the American Chemical Society. Then, in 1974, the Macromolecular Secretariat appointed me to work closely with the six Session chairmen in organizing this Symposium on Science and Technology of Adhesion. Needless to say, the success of the Symposium which took place between April 7 and 10, 1975 in Philadelphia, Pa., is due to their excellent cooperation and the enthusiastic response of con­ tributors. As originally planned, each division was responsible for one session, and most of the papers, including several late con­ tributions, are published in these two volumes of proceedings. During the Symposium, we held a banquet in honor of Professor Herman Mark in celebration of his eightieth birthday. His Plenary Lecture and the Symposium Address by Professor Murray Goodman are published in full at the beginning of the first volume. I thank Professors Mark and Goodman for their excellent presentations on this memorable occasion.