Polydomain model predictions of molecular orientation in isothermal channel flows of thermotropic liquid crystalline polymers

Jun Fang, Wesley R. Burghardt, Robert A. Bubeck

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We report process simulations of molecular orientation of liquid crystalline polymers for isothermal channel flows in extrusion. The simulations use a "polydomain" model due to Larson and Dol (Larson and Dol, J. Rheol., 35, 539 (1991)), which is implemented by exploiting a nearly exact analogy with a fiber orientation model that is widely used for analysis of composites processing. Simulation results are compared to experimental data previously obtained using a customized X-ray capable extrusion die that allows a wide range of channel flow geometries to be explored. Competition between inhomogeneous shear and extension in these kinematically complex flows has a profound effect on the resulting molecular orientation distributions. We find that the Larson-Doi model successfully predicts most aspects of the experimental observations, demonstrating its utility for process modeling.

Original languageEnglish (US)
Pages (from-to)2258-2269
Number of pages12
JournalPolymer Engineering and Science
Volume48
Issue number11
DOIs
StatePublished - Nov 2008

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Polydomain model predictions of molecular orientation in isothermal channel flows of thermotropic liquid crystalline polymers'. Together they form a unique fingerprint.

Cite this