"Thermotropic polyesters: structure of oriented poly(p-oxybenzoate-co-p- phenylene isophthalate)s’

Erdemir A., Johmson D., KARACAN İ., Tomka J.

POLYMER, vol.29, no.4, pp.597-604, 1988 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 29 Issue: 4
  • Publication Date: 1988
  • Journal Name: POLYMER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.597-604
  • Erciyes University Affiliated: No

Abstract

Previous work has shown that poly(p-oxybenzoate-co-p-phenylene isophthalate) ( and ) fibres spun from nematic mesophase are highly oriented but lack crystalline order. Heat treatment of these ‘as-made’ fibres results in structure regarded as a mosaic of thin crystalline regions consisting of p-phenylene isophthalate sequences in a paracrystalline matrix. This work is concerned with atomic modelling of the copolymer chains. One-dimensional Fourier transforms generated from the models are compared with the observed meridional diffraction traces of the ‘as-made’ fibres. A good match is obtained for the extended chain models containing ‘trans’ conformations of p-oxybenzoate and p-phenylene dioxy units.