Orientation selection in lamellar phases by oscillatory shears

Zhi Feng Huang, Jorge Viñals

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

In order to address the selection mechanism that is responsible for the unique lamellar orientation observed in block copolymers under oscillatory shears, we use a constitutive law for the dissipative part of the stress tensor that respects the uniaxial symmetry of a lamellar phase. An interface separating two domains oriented parallel and perpendicular to the shear is shown to be hydrodynamically unstable, a situation analogous to the thin layer instability of stratified fluids under shears. The resulting secondary flows break the degeneracy between the parallel and perpendicular lamellar orientation, leading to a preferred perpendicular orientation in certain ranges of parameters of the polymer and of the shear.

Original languageEnglish (US)
Article number060501
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume73
Issue number6
DOIs
StatePublished - 2006

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