Miscibility in blends of liquid crystalline poly(p-oxybenzoate-co-p-phenyleneisophthalate) and polyarylate

Kung-Hwa Wei*, Horng Long Tyan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The miscibility of liquid crystalline poly(p-oxybenzoate-co-p-phenyleneisophthalate) (HIQ35) and polyarylate (PAr) coprecipitated from a mixed solvent of phenol/tetrachloroethane was investigated with differential scanning calorimetry. It was found that the amorphous phase of HIQ35 and PAr formed a partially miscible blend at low concentration of HIQ35. No measurable interaction between HIQ35 and PAr occurred when the weight fraction of HIQ35 was close to or less than that of polyarylate, as evidenced by wide-angle X-ray diffraction results. Upon annealing at 315°C for several minutes, the apparent miscibility of HIQ35 with polyarylate appeared as a result of an initial reaction between the polymers. For longer annealing time, the thermal degradation of HIQ35 joined in the reaction. This reaction or degradation in the blend was confirmed by nuclear magnetic resonance analysis and the intrinsic viscosity measurement of the blend.

Original languageAmerican English
Pages (from-to)1581-1589
Number of pages9
JournalJournal of Applied Polymer Science
Volume68
Issue number10
DOIs
StatePublished - 6 Jun 1998

Keywords

  • Differential scanning calorimetry
  • Liquid crystalline poly(p-oxybenzoate-co-p-phenyleneisophthalate)
  • Miscibility

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