Mechanisms of chain diffusion in lamellar block copolymers

T. P. Lodge, M. C. Dalvi

Research output: Contribution to journalArticle

161 Scopus citations

Abstract

We report measurements of chain diffusion in macroscopically oriented, well-entangled lamellar block copolymers. Diffusion in the lamellar plane is proposed to occur by an activated reptation mechanism when the composition profile is roughly sinusoidal. At higher degrees of segregation a crossover to an entropically limited block retraction mechanism is apparent. Diffusion through the layers reflects a thermodynamic barrier determined by the combination of temperature and molecular weight.

Original languageEnglish (US)
Pages (from-to)657-660
Number of pages4
JournalPhysical Review Letters
Volume75
Issue number4
DOIs
StatePublished - Jan 1 1995

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