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Linear rheological behaviour of polyisoprene-polystyrene hetero-star and linear diblock copolymer melts

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JournalJournal of the Chemical Society, Faraday Transactions
DatePublished - 1 Dec 1995
Issue number16
Volume91
Number of pages7
Pages (from-to)2403-2409
Original languageEnglish

Abstract

Block copolymers of polyisoprene and polystyrene have been synthesised in comparable series of linear diblocks and four-arm stars containing two arms of each chemistry. The linear rheology of melt samples, which had been briefly annealed, revealed relaxation identified with entanglements, mesostructure and with the small domains. Comparison between the linear and star series indicates that the difference in molecular topology hinders the slower relaxations of the microstructure as well as the ordinary viscoelastic relaxations. A mechanism of suppressed diffusion perpendicular to the interfaces is proposed.

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