【摘要】 <正>高性能耐高温树脂基复合材料是航天航空领域的关键材料,是制造下一代超音速飞机和卫星等的必备材料,已引起学术界和工业界的广泛关注.制约这一类复合材料高性能化发展的瓶颈是高性能树脂预聚体.目前广泛应用的特种工程塑料(如聚芳醚酮、聚芳砜、聚酰亚胺等)都具有全芳香性结构,更多还原

【Abstract】 A novel macrocycle-terminated polyimide oligomer and the model compound,which were consi-dered as the most simple molecule to be representative of the oligomer,were prepared.The aromatic ether ketone macrocycle was prepared by aromatic nucleophilic substitution from(3-methoxy)phenylhydroquinone and difluorine compound under pseudohigh-dilution condition.The polyimide oligomer exhibited high thermal stability due to its wholly aromatic structure.Under heating treatment,the oligomer and the model compound can form fully aromatic thermoset polyimide by ring-opening reaction without catalyst.After crosslinking,the polyimide showed much higher glass transition temperature and excellent thermal stability with temperature at 5% mass loss above 550 ℃.更多还原