Transient molecular orientation and rheology in flow aligning thermotropic liquid crystalline polymers

Victor M. Ugaz, Wesley Roth Burghardt*, Weijun Zhou, Julia A. Kornfield

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Significant progress was made toward conducting in situ structural studies in thermotropic liquid crystalline polymers (LCPs). The confirmation that flow aligning dynamics prevail in at least some main-chain thermotropes calls into question whether the existing body of knowledge accumulated for tumbling lyotropes provides useful insights into the behavior of thermotropic LCPs as well. This paper seeks to address this question by extending such studies to include the transient flow protocols of shear flow inception from a random initial condition, reversal from steady state, nonsteady-state reversal during shear inception, and relaxation upon cessation of shear flow.

Original languageEnglish (US)
Pages (from-to)1029-1064
Number of pages36
JournalJournal of Rheology
Volume45
Issue number5
DOIs
StatePublished - Sep 1 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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