纤维增强基于 α-BPDA 聚酰亚胺复合材料性能

摘要

To understand the properties of the fiber reinforced polyimide composite based on 2, 3, 3', 4'-bi-phenyl-tetracarboxcylic anhydride ( a-BPDA) at high temperature,composite samples were prepare! using carbon fiber and quartz fiber as reinforcement. The T5d decomposition temperature and Tg of composites were 565℃ and 471℃. The experimental results show that the retention of flexural strength, moduli and interlaminate strength of composites are 42% ,55% ,44% at 450℃ , respectively; after treated 50 hours at 400℃ in air the retention of flexural strength and moduli of carbon fiber reinforced composites are 66% and 95% ;and the coefficient transmit heat of quartz fiber reinforced composites at 300℃ ,500℃ are 0.503 and 0.657W/(m·K).%为了考察基于α-BPDA 聚酰亚胺复合材料的高温性能,制备了纤维增强复合材料,进行了高温力学和热物理性能的测试.研究结果表明纤维增强复合材料的T(s)d 分解温度为565℃；Tg 超过471℃；在450℃下的弯曲强度保持率大于42％,弯曲模量保持率大于55％,短梁剪切强度保持率超过44％；400℃空气热老化50 h后碳纤维复合材料的弯曲强度保持率66％,弯曲模量保持率为95％；300、500℃的石英增强复合材料的热导率分别为0.503和0.657 W/(m·K).