Orientational flipping and flow alignment of a model main-chain thermotropic LCP

Weijun Zhoit, Julia A. Komfield, Victor M. Ugaz, Wesley R. Burghardt

Research output: Contribution to journalConference article

Abstract

A model thermotropic liquid crystalline polymer with low isotropization point, good optical transparency and thermal stability was synthesized and the evolution of orientation during flow was monitored using in situ wide angle X-ray diffraction. The polymer, a random copolyether of dihydroxymethylstilbene coupled with 7- and 9-methylene, showed a rich relationship between mesophase behavior, shear induced orientation and bulk flow properties. In the nematic phase, as DHMS-7,9 is flow-aligning, steady shear aligns its director to a fixed angle, giving rise to a nearly constant orientation parameter at different shear rates. In the x-phase, the polymer showed an interesting orientation flipping from parallel to perpendicular at low shear rates.

Original languageEnglish (US)
Pages (from-to)500-501
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Volume40
Issue number2
StatePublished - Aug 1 1999

ASJC Scopus subject areas

  • Polymers and Plastics

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