Orientational phase transitions in the hexagonal phase of a diblock copolymer melt under shear flow

Details Orientational phase transitions in the hexagonal phase of a diblock copolymer melt under shear flow Orientational phase transitions in the hexagonal phase of a diblock copolymer melt under shear flow

1999-12-07

arxiv.org/abs/cond-mat/9912108v1

Phys. Rev. E, v.61(4), 2000, pp.4125-4132

Physics

Condensed Matter

Soft Condensed Matter

21 pages, 6 eps figures, submitted to Physical Review E

Scientific paper

10.1103/PhysRevE.61.4125

We generalize the earlier theory by Fredrickson [J. Rheol. v.38, 1045 (1994)] to study the orientational behaviour of the hexagonal phase of diblock copolymer melt subjected to steady shear flow. We use symmetry arguments to show that the orientational ordering in the hexagonal phase is a much weaker effect than in the lamellae. We predict the parallel orientation to be stable at low and the perpendicular orientation at high shear rates. Our analysis reproduces the experimental results by Tepe et al. [Macromolecules v.28, 3008 (1995)] and explains the difficulties in experimental observation of the different orientations in the hexagonal phase.

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