142 Advances in Polymer Science Editorial Board: A. Abe. A.-C ...

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VI Editorial Board Prof. James E. McGrath Polymer Materials and Interfaces Laboratories Virginia Polytechnic and State University 2111 Hahn Hall Blacksbourg Virginia 24061-0344, USA E-maiI: jmcgrath @chemserver.chem. vt.edu Prof. Lucien Monnerie l~cole Supdrieure de Physique et de Chimie Industrielles Laboratoire de Physico-Chimie Structurale et Macromol6culaire 10, rue Vauquelin 75231 Paris Cedex 05, France E-mail: lucien.monnerie@espci.fr Prof. Samuel I. Stupp Department of Materials Science and Engineering University of Illinois at Urbana-Champaign 1304 West Green Street Urbana, IL 61801, USA E-mail: s-stupp@uiuc.edu Prof. Ulrich W. Suter Department of Materials Institute of Polymers ETZ,CNB E92 CH-8092 Zfirich, Switzerland E-maih suter@ifp.mat.ethz.ch Prof. Edwin L. Thomas Room 13-5094 Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139, USA E-mail. thomas@uzL mit.edu Prof. Gerhard Wegner Max-Planck-Institut fiir Po|ymerforschung Ackermannweg 10 Postfach 3148 D-55128 Mainz, FRG E-maih wegner@mpip-mainz.mpg.de Prof. Robert J. Young Manchester Materials Science Centre University of Manchester and UMIST Grosvenor Street Manchester M1 7HS, UK E-mail: robert.young@umist.ac.uk
Preface While books have been written on many topics of Polymer Science, no compre- hensive treatise on long-chain branching has ever been composed. This series of reviews in Volume 142 and 143 of Advances in Polymer Science tries to fill this gap by highlighting active areas of research on branched polymers. Long-chain branching is a phenomenon observed in synthetic polymers and in some natural polysaccharides. It has long been recognized as a major molecular parameter of macromolecules. Its presence was first surmised by H. Stau- dinger and G. V. Schuh (Ber. 68, 2320, 1935). Interestingly, their method of iden- tification by means of the abnormal relation between intrinsic viscosity and molecular weight has survived to this day. Indeed, the most sophisticated method for analysis of long-chain branching uses size exclusion fractionation with the simultaneous recording of mass, molecular weight and intrinsic viscosity of the fractions. In the 1940s and 1950s, random branching in polymers and its effect on their properties was studied by Stockmayer, Flory, Zimm and many others. Their work remains a milestone on the subject to this day. Flory dedicated several chapters of his "Principles of Polymer Chemistry" to non-linear polymers. Especially important at that time was the view that randomly branched polymers are inter- mediates to polymeric networks. Further developments in randomly branched polymers came from the introduction of percolation theory. The modern aspec- ts of this topic are elaborated here in the chapter by W. Burchard. As polymer science developed, greater control over the architecture of polymer molecules was obtained. In polyolefins synthesis, this was due to the introduction of new catalysts. The development of anionic living polymerization with the concomitant formation of narrow molecular weight distribution polymers and an highly reactive functional end group opened the route not only to block copolymers but also to branched polymers with highly controlled architectures such as stars, combs and graft copolymers. The model polymers allowed us to establish relations between the molecular architecture and the physical properties of the branched polymers. This development has been reviewed by e.g. G.S. Grest et al. Adv. Chem. Phys. 94, 65 (1996). One chapter in this series deals with the newer use of cationic polymerization to form polymers and copolymers with controlled long-chain branched struc- tures. Another chapter deals with the use of anionic polymerization to prepare
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Author Index Volumes 101-142 Author
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Subject Index Addition-fragmentatio
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Subject Index 241 Microphases 11z,
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