A type of main-chain type polybenzoxazine with amic acid and benzoxazine groups as repeating units in the main chain, termed as poly(benzoxazine amic acid) (PBzaa), has been synthesized. Different from traditional main chain polybenzoxazines, PBzaa can undergo polymerization and imidization behaviors to form crosslinked polyimide (cPI) after certain thermal treatment. Besides, the cPI can further undergo a typical cyclization behavior to give crosslinked polybenzoxazole (cPBO) after further thermal treatment. Additionally, a model reaction is designed from the reaction of 3-Phenyl-2,4-dihydro-2H-benzo[e][1,3]oxazin-9-amine with phthalic anhydride. The structure of model compound is confirmed by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H NMR) spectroscopies. The polymerization behavior of benzoxazine monomers and main-chain polybenzoxazine are studied by differential scanning calorimetry (DSC). Thermal properties of the crosslinked polymers are also studied by thermogravimetric analysis.

Ultra high performance crosslinked polybenzoxazole via thermal conversion from high performance crosslinked polyimide based on main-chain type polybenzoxazine

248th National Meeting (2014)

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