Perfluoroalkylene ether bibenzoxazole polymers

摘要

Thermooxidatively and hydrolytically stable perfluoroalkylene ether bibenzoxazole polymers having improved viscoelastic properties are synthesized by the polycondensation of perfluoroalkylene ether bis(o- aminophenol) compounds with thioimidate esters derived primarily from tetrafluoroethylene oxide but end-capped with hexafluoropropylene oxide. Based on their lower glass transition temperature, the polymers have a very broad use temperature range which renders them particularly useful under severe environmental conditions encountered in aerospace elastomer applications such as seals and sealants.