Morphology control of poly(p-mercaptobenzoyl) by modification of oligomer end-group

Kunio Kimura, Daisuke Nakajima, Kazufumi Kobashi, Shin Ichiro Kohama, Tetsuya Uchida, Yuhiko Yamashita

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Influence of acyl end-group of oligomers on morphology of poly(p-mercaptobenzoyl)(PMB) was examined by the polymerization of S-acyl-4-mercaptobenzoic acids having the different acyl groups and their dimers in liquid paraffin at 260-300°C. The polymerization of S-acetyl-4- mercaptobenzoic acid afforded PMB whiskers, whereas the polymerization of S-propionyl-4-mercaptobenzoic acid, S-butyryl-4-mercaptobenzoic acid and S-valeryl-4-mercaptobenzoic acid yielded PMB microspheres. The microspheres were formed by the liquid-liquid phase separation of oligomers induced by the longer acyl end-groups than acetyl group of the oligomers due to the reduction of freezing point of oligomers. In contrast to this, the polymerizations of their dimers afforded needle-like and slab-like crystals instead of microspheres. In these polymerizations, the crystallization was induced due to the increase of the molecular weight of the phase-separated oligomers, leading to the increase of the freezing point of oligomers. The morphology of PMB could be controlled by the chemical modification of oligomer end-groups.

Original languageEnglish
Pages (from-to)471-479
Number of pages9
JournalPolymer Journal
Volume37
Issue number7
DOIs
Publication statusPublished - 2005

Keywords

  • End-group
  • Microsphere
  • Morphology
  • Oligomer
  • Phase Separation
  • Poly(p-mercaptobenzoyl)
  • Whisker

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

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