Equilibrium and shear-induced conformations of a side-chain liquid crystal polymer
Laboratoire Léon Brillouin (CEA-CNRS) - Saclay, F-91191
Accepted: 15 September 2000
These studies delineate the conformations adopted by a side-chain liquid-crystalline polymer subjected to a steady-state shear flow as well as the corresponding me so pha se director orientations. Two distinct director orientations are identified in the nematic phase, giving evidence of a shear-induced transition from a flow-aligning to a non–flow-aligning behavior. This transition coincides, at rest, with a subtle change from prolate to oblate polymer main-chain conformation. In the smectic phase, the layers form multilayer cylinders oriented along the velocity axis.
PACS: 36.20.Ey – Macromolecules and polymer molecules: Conformation (statistics and dynamics) / 64.70.Md – Transitions in liquid crystals / 83.50.Ax – Steady shear flows
© EDP Sciences, 2000