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

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VIII Preface asymmetric star polymers. The asymmetry is introduced when the arms of the polymer differ in molecular weight, chemical composition or in their topologi- cal placement. The synthesis of these polymers has led to new insights in micro- separation processes of block copolymers. Anionic and cationic living polymerization has also led to macromonomers. Highlights of recent developments in poly(macromonomers) homo, comb and graft copolymers are reviewed by K. Ito. The poly(macromonomers) with their multiple densely packed small linear sub- chains often lead to monomolecular micelles. Very recently, highly regular, highly controlled, dense branching has been developed. The resulting"dendrimers" often have a spherical shape with special interior and surface properties. The synthesis and properties of dendrimers has been reviewed (see e.g.G.R. Newkome et al."Dendritic Molecules", VCH, 1996). In this series, a chapter deals with the molecular dimensions of dendrimers and with dendrimer-polymer hybrids. One possible development of such materials may be in the fields of biochemistry and biomaterials. The less perfect "hyperbranched polymers" synthesized from A2B-type monomers offer a real hope for large scale commercialization. A review of the present status of research on hyperbranched polymers is included. The link between the long-chain branch structure and the properties of the polymer has to be established experimentally by means of model branched polymers. This link can also be derived theoretically or through computer modeling. As a result, a large sub-field of study has emerged. The methods and results of this theoretical work are systematically reviewed by J. Freire. Where available, comparisons with experimental results are made. The final chapter develops the most modern insights in the relation between the rheological properties and the large scale architecture of polymers. Indeed, the largest effects of branching are encountered in their melt relaxation properties. In the absence of reptation, which dominates relaxation processes in linear polymers, a rich variety of other relaxation processes becomes apparent. The control ot the melt properties of polymers by means of their long-chain branch architecture will continue to lead to new industrial applications. Ottawa, July 1998 J. Roovers
Contents Synthesis of Branched Polymers by Cationic Polymerization B. Charleux, R. Faust .............................................. Asymmetric Star Polymers: Synthesis and Properties N. Hadjichristidis, S. Pispas, M. Pitsikalis, H. Iatrou, C. Vlahos ............ 71 Poly(macromonomers): Homo- and Copolymerization K. Ito, S. Kawaguchi ................................................ 129 Dendrimers and Dendrimer-Polymer Hybrids ]. Roovers, B. Comanita ............................................. 179 Author Index Volumes 101 - 142 ..................................... 229 Subject Index ..................................................... 239
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Author Index Volumes 101-142 Author
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Author IndexVolumes 101-142 231 Dun
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Subject Index Addition-fragmentatio
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Subject Index 241 Microphases 11z,
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