Development of a Novel Preparation Method for Highly Porous Heat-Resistant Rigid Polymer Network Films and Evaluation of their Properties

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  • Uchida Tetsuya
    Graduate School of Natural Science and Technology, Okayama University
  • Ikeda Ryo
    Graduate School of Natural Science and Technology, Okayama University
  • Suzuki Tomoaki
    Graduate School of Natural Science and Technology, Okayama University
  • Nakayama Ryotaro
    Graduate School of Natural Science and Technology, Okayama University

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A rigid polymer network of poly(p-phenylene benzobisoxazole) (PBO) has excellent mechanical properties and thermal stability. Many nano voids exist within the network. However, a PBO network cannot be formed into films or fibers. Generally, PBO networks are prepared by one-step polycondensation in polyphosphoric acid. In this study, we have prepared a PBO network by a two-step method involving polymerization of a PBO network precursor (pre-PBO network) in N-methyl-2-pyrrolidone followed by thermal cyclization. Heat-resistant porous PBO network films have been successfully obtained by this two-step method. The properties of the PBO network films have been evaluated.

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