Phase transfer catalysis or interfacial catalysis is a syn thetic technique involving transport of an organic or inorganic salt from a solid or aqueous phase into an organic liquid where reaction with an organic-soluble substrate takes place. Over the past 15 years there has been an enormous amount of effort invested in the development of this technique in organic synthe sis. Several books and numerous review articles have appeared summarizing applications in which low molecular weight catalysts are employed. These generally include either crown ethers or onium salts of various kinds. While...
Phase transfer catalysis or interfacial catalysis is a syn thetic technique involving transport of an organic or inorganic salt from a solid or aqueou...
The growing public concern about environmental matters has prompted widespread discussion in the media. Unfortunately much of this public debate has been characterized more by ardour than by information, and often the wildest speculations are pro mulgated with the same appearance of veracity as hard scientific facts. It is an important, and often neglected, duty of scientific societies to make sure that the public is properly informed regard ing the technical aspects of matters of public interest, and to assure that policy decisions of governmental and other agencies are made with due regard...
The growing public concern about environmental matters has prompted widespread discussion in the media. Unfortunately much of this public debate has b...
Alloy is a term commonly associated with metals and implies a composite which may be sinqle phase (solid solution) or heterophase. Whichever the case, metallic alloys generally exist because they exhibit improved properties over the base metal. There are numer ous types of metallic alloys, including interstitial solid solutions, substitutional solid solutions, and multiphase combinations of these with intermetallic compounds, valency compounds, electron compounds, etc. A similar situation exists with polymers. There are numerous types of composites, or "alloys" of polymers in existence today...
Alloy is a term commonly associated with metals and implies a composite which may be sinqle phase (solid solution) or heterophase. Whichever the case,...
Polymer blends, grafts, and blocks, broadly defined, encompass all of the ways in which two or more kinds of poly- mer molecules can be mixed and/or joined. Because these mate- rials exhibit non-linear and often synergistic properties, they have found increasing application in our technology. Their multifarious uses have, in turn, spurred new research efforts, to find yet different ways of joining two kinds of polymer molecules, with novel physical and/or mechanical behavior patterns. In August, 1973, the Polymer Division of the American Chemical Society sponsored a symposium at its meeting...
Polymer blends, grafts, and blocks, broadly defined, encompass all of the ways in which two or more kinds of poly- mer molecules can be mixed and/or j...
The term "alloy" as pertaining to polymers has become an increasingly popular description of composites of polymers, parti- cularly since the publication of the first volume in this series in 1977. Polymer alloy refers to that class of macromolecular materials which, in general, consists of combinations of chemically different polymers. The polymers involved in these combinations may be hetero- geneous (multiphase) or homogeneous (single phase). They may be linked together with covalent bonds between the component polymers (block copolymers, graft copolymers), linked topologically with no...
The term "alloy" as pertaining to polymers has become an increasingly popular description of composites of polymers, parti- cularly since the publicat...
This book contains a collection of original research papers which were presented in honor of the Bordon Award recipient, Professor Eric Baer, on the occasion of the 55th Meeting of the American Chemical Society (Atlanta, Georgia, March, 1981). The contributors are present or former colleagues and students who have worked with him in the Department of Macromolecular Science at Case Institute of Technology of Case Western Reserve University. Throughout his work, Eric Baer has attempted to find the relation ships of solid state structure and hierarchy to the resultant pro perties from which...
This book contains a collection of original research papers which were presented in honor of the Bordon Award recipient, Professor Eric Baer, on the o...
Interest in preparing new polymers peaked about 1966. Since that time, industrial and government support for the synthesis and study of new polymers has steadily declined. Gone are the good days when government funds supported a great push to attain ulti mate thermal stability for organic polymeric materials. Gone are the good days when many chemical companies, encouraged by the obvious potential for rewards, had great interest and provided support for preparing new polymers. We now often hear managers say "we have enough polymers" or "all we need to do is find additional and better ways to...
Interest in preparing new polymers peaked about 1966. Since that time, industrial and government support for the synthesis and study of new polymers h...
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...
The development and use of medical and dental materials are highly interdisciplinary endeavors which require expertise in chemistry, materials science...
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...
The art of using chemical agents for medication dates back into antiquity, although most of the earliest examples used plants, herbs, and other natura...
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...
This book originated in the Proceedings of the Second Symposium on Polymeric Liquid Crystals held by the Division of Polymer Chemistry in the framewor...