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HyperMacs to HyperBlocks : a novel class of branched thermoplastic elastomer.

Hutchings, L.R. and Dodds, J.M. and Rees, D. and Kimani, S.M. and Wu, J.J. and Smith, E. (2009) 'HyperMacs to HyperBlocks : a novel class of branched thermoplastic elastomer.', Macromolecules., 42 (22). pp. 8675-8687.


We demonstrate here the great versatility of the macromonomer approach for the synthesis of long chain hyperbranched polymers (HyperMacs) and describe the synthesis of HyperMacs from polybutadiene and poly(methyl methacrylate) using analogous yet modified synthetic strategies. Furthermore, we report the synthesis, morphology, and mechanical properties of an entirely new class of HyperMacs—HyperBlocks—prepared from the coupling of polystyrene−polyisoprene−polystyrene triblock copolymer macromonomers. Transmission electron microscopy (TEM) studies show that these unconventional block copolymers undergo microphase separation, but the resulting morphologies lack any long-range order. Tensile testing shows that these materials offer promise as a new class of branched thermoplastic elastomer (TPE). Finally, blends of HyperBlock (10%) with a commercial linear TPE produced by Kraton show both enhanced ultimate tensile stress and elongation at break.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright © 2009 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Date accepted:No date available
Date deposited:20 March 2015
Date of first online publication:November 2009
Date first made open access:No date available

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