In situ X-ray scattering measurements and polydomain simulations of molecular orientation development during injection molding of liquid crystalline polymers

Jun Fang*, Wesley Roth Burghardt, Robert A. Bubeck

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We report a coordinated experimental/computational study of injection molding of commercial thermotropic LCPs. In situ synchrotron x-ray scattering, combined with a customized injection molding apparatus, is used to track development of molecular orientation during mold filling for commercial LCPs in two simple plaque mold geometries: square and T-shaped. While geometrically simple, these flows are characterized by complex inhomogenous mixtures of shear and extension, which influence orientation development. Use of high brilliance synchrotron radiation coupled with a high speed CCD detector provides sufficient time resolution (∼12 frames per second) to resolve transient orientation dynamics during mold filling. The experiments are coordinated with process simulations performed using commercial mold filling software. A close analogy between the Folgar-Tucker fiber orientation model and the Larson-Doi polydomain model for textured liquid crystalline polymers is exploited to allow testing of Larson-Doi model predictions in injection molding processing.

Original languageEnglish (US)
Title of host publicationThe XVth International Congress on Rheology - The Society of Rheology 80th Annual Meeting
Pages39-41
Number of pages3
DOIs
StatePublished - Sep 11 2008
Event15th International Congress on Rheology - Monterey, CA, United States
Duration: Aug 3 2008Aug 8 2008

Publication series

NameAIP Conference Proceedings
Volume1027
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other15th International Congress on Rheology
CountryUnited States
CityMonterey, CA
Period8/3/088/8/08

Keywords

  • In situ scattering
  • Injection molding
  • Liquid crystalline polymers
  • Polydomain simulation
  • Thermotrope

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

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