Macromolecular Composites of Extruded Thermotropic Polymer Sheets

Yoshiaki Ide, Tai-Shung Chung

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Using two types of thermotropic liquid-crystal polymers, experimental results reconfirmed previous reports that the relaxation time of extruded liquid-crystal polymers is much longer than that of conventional polymers. The initial modulus and elongation of sheets extruded with liquid-crystal polymers were found to be strongly dependent on the gauge length. In addition, it was observed, for the first time, that the mechanical properties of the extruded thermotropic copolyesters follow the general equations for fiber-reinforced composites such that the angular dependence of the tensile strength of the extruded liquid-crys-tal polymeric sheets obeys the Tsai-Hill theory, while the angular dependence of the initial modulus follows the Lees equation. These results suggest that the highly oriented liquid-crystal domains may be considered as reinforcing fibers in the extruded articles, and their mechanical properties can be predicted using existing composite theories.

Original languageEnglish (US)
Pages (from-to)497-509
Number of pages13
JournalJournal of Macromolecular Science, Part B
Volume23
Issue number4-6
DOIs
StatePublished - Aug 1 1984

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

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