摘要
采用活性单体原位聚合方法,由2,3,3',4'-联苯四甲酸二乙酯为芳香族二酸二酯、对苯二胺与间苯二胺混合物为芳香族二胺、降冰片稀二甲酸单乙酯为反应性封端剂制备了系列PMR型聚酰亚胺树脂。研究了树脂的化学结构及其计算分子量等对其成型工艺性能和耐热性能的影响规律。以优选树脂体系为基体与碳纤维复合制备的碳纤维增强聚酰亚胺树脂基复合材料表现出优良的耐热性能与力学性能,室温下,弯曲强度为1 560 MPa,弯曲模量为137 GPa,层间剪切强度为56 MPa,在370℃的高温下,其力学性能保持率大于50%。
PMR polyimides with asymmetric biphenylimide chain segments were prepared by using diethylester of 2,3,3′,4′-biphenyltetracarboxylic dianhydride, the mixture of p-phenylenediamine and m-phenylenediamine, as well as monoethylester of 5-norbornene-2,3-dicarboxylic acid as endcaping agent. Influence of the calculated molecular weights and diamine mixture compositions of the resin on its melt processability and thermal property was investigated. The carbon fiber-reinforced polyimide composite prepared exhibited good mechanical properties at room temperature with flexural strength of 1 560 MPa, flexural modulus of 137 GPa, and shear strength of 56 MPa. The composite exhibited mechanical property retention of more than 50% at 370℃.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2009年第2期50-53,共4页
Aerospace Materials & Technology
