Synthesis and characterization of segmented copolymers of aromatic polyether sulfone and thermotropic liquid crystalline poly(oxy-1,4-phenylenecarbonyl-co-oxy-2,6-naphthaloyl)

Yu Ming Chang, Chain-Shu Hsu*, Min Chi Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The synthesis of segmented copolymers of aromatic polyether sulfone and thermotropic liquid crystalline poly(oxy-1,4-phenylenecarbonyl-co-oxy-2,6-naphthaloyl) is presented. The segmented copolymers were prepared by solution polycondensation of hydroxy-terminated polyether sulfone with 4-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid in a mixture of triphenylphosphine, pyridine and hexachloroethane. The obtained polymers were fractionated to isolate the pure segmented copolymers. All of the segmented copolymers reveal two glass transitions. The first glass transition at about 75 °C belongs to the segmental motions of liquid crystalline polyester blocks. The second glass transition at about 140 °C belongs to the segmental motions of polyether sulfone blocks. Optical polarizing microscopy and X-ray diffraction measurements verify the presence of a nematic liquid crystalline phase for the segment copolymers. The experimental results indicate that the segmental copolymers have a microphase-separated morphology, i.e., both amorphous and liquid crystalline properties are shown by the polyether sulfone and liquid crystalline polyester segments, respectively.

Original languageEnglish
Pages (from-to)250-255
Number of pages6
JournalMaterials Chemistry and Physics
Volume43
Issue number3
DOIs
StatePublished - 1 Jan 1996

Keywords

  • Aromatic polyether sulfones
  • Segmented copolymers
  • Thermotropic liquid crystals

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