Novel Fabrication of Three-Dimensional Homogeneous Microporous Polyimide Membrane

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  • Sugawara Tsukasa
    PF Business Promotion Division, Tokyo Ohka Kogyo Corporate Limited
  • Koshiyama Jun
    PF Business Promotion Division, Tokyo Ohka Kogyo Corporate Limited
  • Kawai Akira
    Department of Electrical Engineering, Nagaoka University of Technology

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Abstract

A polyimide porous membrane was fabricated using a relatively simple novel process. The process involves making a coating from a polyamic acid solution in which silica fine particles were dispersed, baking it for imidization, etching it with HF for silica removal, and controlling pore size with alkaline solution. In order to construct a porous structure, removal of silica fine particles by HF and control of pore diameter by an alkali solution were effective. Surface and cross section observation of the porous membrane by SEM and pore size measurement by a perm-porometer revealed that the membrane had a three-dimensional homogeneous microporous structure. Thermal analysis and organic solvent immersion testing confirmed the high heat resistance and chemical resistance of the porous membrane. The unique features revealed in this testing suggest that this porous membrane has various potential applications.

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