Mechanisms of chain diffusion in lamellar block copolymers

T. P. Lodge, M. C. Dalvi

Research output: Contribution to journalArticlepeer-review

161 Scopus citations


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
Issue number4
StatePublished - 1995


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