以4,4′-二氨基二苯砜(DDS)为二胺单体,3,3′4,4′-二苯酮四羧酸二酐(BTDA)、4,4′-氧双邻苯二甲酸酐(ODPA)分别为二酐单体,制得主链含砜基及桥联结构的聚酰亚胺(PI)模塑粉,考察了结构对PI的性能影响。结果表明,2种PI都具有半结晶聚合物的特性,在氮气中和空气中都具有较好的热稳定性,且熔融温度远低于分解温度。 4,4’-diaminodiphenyl sulfone (DDS) as a diamine monomer, 3,3’4,4’-benzophenone tetracarboxylic dianhydride (BTDA), 4,4’-oxybis (DDPA) were dianhydride monomers to prepare polyimide (PI) molding powder with sulfone group and bridged structure in the main chain. The effects of structure on the properties of PI were investigated. The results show that the two kinds of PI have the characteristics of semi-crystalline polymers, both in nitrogen and air have good thermal stability, and the melting temperature is far below the decomposition temperature.