Novel network morphology of poly(p-oxybenzoyl)

Kunio Kimura, Shin Ichiro Kohama, Satomi Kondoh, Tetsuya Uchida, Yuhiko Yamashita, Takeshi Oohazama, Yoshimitsu Sakaguchi

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5 Citations (Scopus)

Abstract

Polymerization of 4-acetoxybenzoic acid (ABA) with 3,5-diacetoxybenzoic acid (DABA) was examined to control the morphology of poly(p-oxybenzoyl) (POB). Polymerizations were carried out at a concentration of 1.0% in an aromatic solvent Therm S-1000® (mixture of dibenzyltoluene) at 320°C. Polymerization of ABA yielded the POB fibrillar crystals, but the polymerization with DABA at a concentration in the feed (χf) of 0.10-0.15 afforded novel network structures comprised of spheres connected by fibrillar crystals. The diameter of the spheres prepared at χf of 0.15, which were 0.7 and 5.0 μm, showed bimodality. The network distance, fibril length, and fibril width were 6.1, 2.6, and 0.1 μm, respectively. They possessed high crystallinity. The network structure was formed as follows. Co-oligomers were first precipitated in the beginning of the polymerization by liquid-liquid phase separation to form the microdroplets. The fibrillar crystals were formed in the coalesced spheres by the crystallization of oligomers induced by the increase of molecular weight. The fibrillar crystals connecting the spheres gradually appeared owing to the shrinkage of the spheres. The fibrillar crystals grew from the surface of the spheres with the crystallization of homo-oligomers of 4-oxybenzoyl units, and finally the network structure was completed.

Original languageEnglish
Pages (from-to)1624-1634
Number of pages11
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume43
Issue number8
DOIs
Publication statusPublished - Apr 15 2005

Keywords

  • Morphology
  • Networks
  • Phase separation
  • Polycondensation
  • Polyesters

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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  • Cite this

    Kimura, K., Kohama, S. I., Kondoh, S., Uchida, T., Yamashita, Y., Oohazama, T., & Sakaguchi, Y. (2005). Novel network morphology of poly(p-oxybenzoyl). Journal of Polymer Science, Part A: Polymer Chemistry, 43(8), 1624-1634. https://doi.org/10.1002/pola.20639