Shear alignment of sphere-morphology block copolymer thin films with viscous fluid flow

Mingshaw W. Wu, Richard A. Register, Paul M. Chaikin

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The effect of shear on crystalline order is interesting fundamentally, as well as technologically, for producing long-range alignment of micron- and nanoscale structures. We study the influence of shear on a sphere-forming diblock copolymer thin film consisting of a stack of two to six hexagonal layers, using a stress-controlled rheometer to transmit the stress through a viscous fluid layer. Above a threshold stress, the hexagonal layers align macroscopically in the “easy shearâ direction. A simple phenomenological model with an orientation-dependent order-disorder temperature, TODT* = TODT [1a (I• Ic) sin2 (3II)] and recrystallization describes the influence of stress level, temperature, and shearing time remarkably well.

Original languageEnglish (US)
Article number040801
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume74
Issue number4
DOIs
StatePublished - Oct 18 2006

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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