Fabrication of poly(2-oxy-6-naphthoyl) particles by direct polycondensation of 2-hydroxy-6-naphthoic acid

Kunio Kimura, Toshiyuki Horii, Shin Ichiro Kohama, Yuhiko Yamashita

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Morphology control of poly(2-oxy-6-naphthoyl) (PON) was examined by using reaction-induced crystallization of oligomers during direct polycondensation of 2-hydroxy-6-naphthoic acid with p-toluenesulfonyl chloride and N,N-dimethylformamide in pyridine. PON particles were obtained of which the diameter was in the range of 8.0-8.3 μm. The particles were comprised of many lamellae and exhibited spherulitic morphology. They possessed high crystallinity evaluated from wide-angle X-ray scattering (WAXS). Formation mechanism of the particles was clarified from the results of morphology observation, yield, density and WAXS. When the number average degree of polymerization of the oligomers exceeded a critical value of ca. 4-5, they were precipitated to form lamellae. The lamellae grew to spherulites through screw dislocation with continuous precipitation of the oligomer from the solution. Finally, further polymerization occurred gradually in the precipitates.

Original languageEnglish
Pages (from-to)693-697
Number of pages5
JournalPolymers for Advanced Technologies
Issue number9
Publication statusPublished - Sept 1 2005


  • Crystallization
  • Oligomers
  • Particle
  • Poly(2-oxy-6-naphthoyl)
  • Polycondensation

ASJC Scopus subject areas

  • Polymers and Plastics


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