Gaussian- to stretched-coil transition in block copolymer melts

Kristoffer Almdal, Jeffrey H. Rosedale, Frank S. Bates, George D. Wignall, Glenn H. Fredrickson

Research output: Contribution to journalArticle

237 Scopus citations

Abstract

Two scaling regimes, DN with =0.49 0.02 and 0.80 0.04, have been identified in a model set of nearly symmetric diblock copolymer melts, where D and N are the system peridocity and degree of polymerization, respectively. The crossover from =0.49 to 0.80 is identified as the Gaussian to stretched-coil transition (GST). Contrary to current theory, the GST occurs well below the order-disorder transition (ODT), NGST=0.57NODT. We associate =0.80 with the crossover from weak-segregation (=1/2) to strong-segregation (=2/3) behavior.

Original languageEnglish (US)
Pages (from-to)1112-1115
Number of pages4
JournalPhysical Review Letters
Volume65
Issue number9
DOIs
StatePublished - Jan 1 1990

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