Shear-induced isotropic-to-lamellar transition

Kurt A. Koppi, Matthew Tirrell, Frank S. Bates

Research output: Contribution to journalArticlepeer-review

221 Scopus citations


Reciprocating shear is found to increase the isotropic-to-lamellar transition temperature in a symmetric diblock copolymer melt. The temperature at which the isotropic state becomes unstable rapidly approaches the ordering transition as the shear rate increases. Shear-induced ordering results in lamellae orientation with wave vectors directed normal to the shear and velocity gradient directions. These results are anticipated by a recent theory that accounts for the suppression of fluctuations by a symmetry breaking field in this class of weakly first-order phase transitions.

Original languageEnglish (US)
Pages (from-to)1449-1452
Number of pages4
JournalPhysical Review Letters
Issue number10
StatePublished - Jan 1 1993

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