Fabrication of Rod-like Crystals of Poly(p-oxycinnamoyl) by Hydrodynamically Induced Crystallization during Solution Polymerization

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  • Kohama Shin-ichiro
    Graduate School of Environmental Science, Okayama University, 3-1-1 Tsushima-naka,Okayama 700-8530, JAPAN
  • Muraoka Mayuko
    Graduate School of Environmental Science, Okayama University, 3-1-1 Tsushima-naka,Okayama 700-8530, JAPAN
  • Yamazaki Shinichi
    Graduate School of Environmental Science, Okayama University, 3-1-1 Tsushima-naka,Okayama 700-8530, JAPAN
  • Kimura Kunio
    Graduate School of Environmental Science, Okayama University, 3-1-1 Tsushima-naka,Okayama 700-8530, JAPAN

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Abstract

Microspheres of poly(p-oxycinnamoyl) (POC) were obtained by the polymerization of (E )-4- acetoxycinnamic acid in aromatic solvent at 320degree and a concentration of 1.5% without stirring via liquid-liquid phase separation of oligomers. In contrast to this, rod-like crystals were formed under shearing with more than 700 rpm. The obtained rod-like crystals were 10-15 um in length and 1.0-1.5 um in width having many thorns on the surface. The critical stirring speed for the onset of Taylor vortices was in agreement with 700 rpm and the crystallization of oligomers was hydrodynamically induced by the generation of Taylor vortices affording the rod-like crystals. Stirring influenced the morphology of POC significantly and this work provided a new procedure for the fabrication of fine fibers of intractable aromatic polymers.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 64 (8), 220-223, 2008

    The Society of Fiber Science and Technology, Japan

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