Synthesis and Characterization of Novel Aromatic Polyimides from Aromatic Diamine and 3,3′′′′′,4,4′′′′′-p-Sexiphenyltetracarboxylic Dianhydride

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  • MORIKAWA Atsushi
    Department of Materials Science, Faculty of Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan
  • ONO Katsumichi
    Department of Materials Science, Faculty of Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan

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タイトル別名
  • Synthesis and Characterization of Novel Aromatic Polyimides from Aromatic Diamine and 3,3''''',4,4'''''-p-Sexiphenyltetracarboxylic Dianhydride.

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A new rigid tetracarboxylic dianhydride, 3, 3''''', 4, 4'''''-p-sexiphenyltetracarboxylic dianhydride, was synthesized in seven steps starting from diethyl 4-bromophthalate. New aromatic polyimides containing a p-sexiphenyl unit were synthesized from this tetracarboxylic dianhydride and various aromatic diamines by the conventional two-step procedure of ring-opening polyaddition in a polar amide-type solvent and subsequent thermal cyclic dehydration. These polyimides had inherent viscosities of 1.20—1.69dLg-1, and were insoluble in organic solvents. The polyimides were characterized by differential scanning calorimetry (DSC), thermogravimetry (TG), wide-angle X-Ray diffraction measurements, and dynamic mechanical analysis (DMA). Typical polyimides were noncrystalline and showed excellent thermal stability, and had glass transition temperatures (Tg) at about 250°C. Decrease in the modulus at the glass transition temperature was less than corresponding polyimides having no p-sexiphenyl unit due to the presence of the rigid p-sexiphenyl unit.

収録刊行物

  • Polymer Journal

    Polymer Journal 32 (11), 948-953, 2000

    The Society of Polymer Science, Japan

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