Low Temperature Film-fabrication of Hardly Soluble Alicyclic Polyimides with High Tg by A Combined Chemical and Thermal Imidization Method

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  • Matsumoto Toshihiko
    Department of Life Science and Sustainable Chemistry, Faculty of Engineering, Tokyo Polytechnic University
  • Ishiguro Eriko
    Department of Life Science and Sustainable Chemistry, Faculty of Engineering, Tokyo Polytechnic University
  • Komatsu Shinichi
    Central Technical Research Laboratory, JX Nippon Oil & Energy Corporation,

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  • Low Temperature Film-fabrication of Hardly Soluble Alicyclic Polyimides with High T<sub>g</sub> by a Combined Chemical and Thermal Imidization Method

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The alicyclic dianhydride having cyclopentanone bis-spironorbornane structure (CpODA) was polycondensated with aromatic diamines at room temperature to give poly(amic acid)s having an inherent viscosity (ηinh) range of 1.3-0.54 dL/g. The poly(amic acid)s were imidized by three methods. The imidization ratio of PI(CpODA+3,4’-DDE) reached 100% at 200 °C using a combined chemical and thermal imidization method. All the polyimide films possessed excellent thermal stability and most of the polyimides had Tg’s over 330 °C. The CTE value of thermally imidized PI(CpODA+4,4’-DABA) was as low as 15 ppm/K. The polyimide films exhibited λcut-off’s shorter than 336 nm, and the Tvis value of each polyimide film was over 85%. Especially, PI(CpODA+3,4’-DDE) prepared by a combined chemical and thermal method had outstanding optical properties (Tvis:88 %, λcut-off’s:278 nm) due to the low temperature film-fabrication.

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