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采用热塑性聚酰亚胺膜熔渗法,制备了单向玻璃纤维/嵌段共聚聚酰亚胺膜层压复合材料,考察了嵌段共聚聚酰亚胺的理论分子量、嵌段比(由BPDA段含量表示)对复合材料力学性能的影响。结果表明,分子量和嵌段比能显著影响嵌段共聚聚酰亚胺的分子链柔性,复合材料的弯曲强度、弯曲模量、层间剪切强度和冲击强度均随理论分子量的增大或刚性段含量的增加呈现出先增加后降低的趋势,最大弯曲强度、最大弯曲模量、最大层间剪切强度和最大冲击强度分别达到1224.52MPa、31.82GPa、70.56MPa和447.55kJ/m2。
The thermoplastic polyimide film infiltration method was used to prepare the unidirectional glass fiber / block copolymer polyimide film laminated composite material. The theoretical molecular weight, block ratio (calculated by BPDA Segment content) on the mechanical properties of composites. The results showed that the molecular weight and the block ratio significantly affected the molecular chain flexibility of the block copolymer polyimide. The bending strength, flexural modulus, interlaminar shear strength and impact strength of the polyimide were all increased with the increasing of the theoretical molecular weight or the rigidity The maximum bending strength, maximum flexural modulus, maximum interlaminar shear strength and maximum impact strength reached 1224.52MPa, 31.82GPa, 70.56MPa and 447.55kJ / m2, respectively.