Morphosynthesis of poly(ether ketone) by reaction-induced crystallization during polymerization

Kanji Wakabayashi, Naofumi Sumi, Shinichi Yamazaki, Tetsuya Uchida, Kunio Kimura

Research output: Contribution to journalArticlepeer-review


Morphology control of poly(ether ketone) (PEK) was examined by using the crystallization during the nucleophilic aromatic substitution reaction of potassium salt of 4-fluoro-4′-hydroxybenzophenone. Polymerizations were carried out at 290 °C. The PEK was obtained as precipitates and its morphology was highly influenced by the polymerization condition such as the solvent, the concentration and the polymerization time. High crystalline spindle-like crystals were obtained by the polymerization in diphenyl sulfone (DPS) at a concentration of 5.0% for 2 h with the yield of 86%. The average length and width were 1.4 μm and 300 nm respectively, and the maximum thickness was 130 nm. The surface was not smooth and it was hilly. The spindle-like crystal was likely consisted of multilayered lamellae comprised of the microcrystallites. The molecules were oriented perpendicular to the lamella. The polymerization in DPS at a higher concentration of 10.0% afforded the networks of nanofibres, of which the diameter was 100-250 nm. The obtained PEK precipitates possessed excellent thermal properties.

Original languageEnglish
Pages (from-to)1787-1795
Number of pages9
JournalEuropean Polymer Journal
Issue number10
Publication statusPublished - Oct 2012


  • Fibre
  • Morphology
  • Poly(ether ketone)
  • Reaction-induced crystallization
  • Spindle

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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