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Multigraft Copolymer Superelastomers: Synthesis Morphology, and Properties...

by David W Uhrig, Ralf Schlegel, Roland Weidisch, Jimmy W Mays
Publication Type
Journal
Journal Name
European Polymer Journal
Publication Date
Page Numbers
560 to 568
Volume
47
Issue
4

The synthesis of well-defined multigraft copolymers having a polydiene backbone with polystyrene side chains is briefly reviewed, with particular focus on controlling branch point spacing and branch point functionality. Use of living anionic polymerization and chlorosilane linking chemistry has led to the synthesis of series of materials having regularly spaced trifunctional (comb), tetrafunctional (centipede), and hexafunctional (barbwire) branch points. The morphologies of these materials were characterized by transmission electron microscopy and small-angle X-ray scattering, and it was found that the morphologies were controlled by the local architectural asymmetry associated with each branch point. Mechanical properties studies revealed that such multigraft copolymers represent a new class of thermoplastic elastomers (TPEs) with superior elongation at break and low residual strains as compared to conventional TPEs.