摘要
以石墨、碳纤维(CF)、聚酰亚胺(PI)三元复合材料为研究对象,考察了CF体积含量对PI三元复合材料导热性能的影响,并采用了拟二元体系模型探讨了石墨和CF填充PI复合材料的协同效应。结果表明,CF的加入可以提高复合材料的力学性能:拉伸强度呈现先升高后降低的趋势。当CF含量(VCF)为11.8%(体积分数,下同)时,拉伸强度可达66.37 MPa;弯曲强度随着VCF的增加而增加,当VCF为24.6%时,弯曲强度可达103.3 MPa。复合材料热导率呈非线性增长,表明石墨和CF间存在协同效应;当VCF为34.1%时,环境扫描电子显微镜分析表明,CF与石墨能很好地搭接,增大了传热面积,复合材料热导率可达0.512 W/(m.K),约是其计算值的2倍。
In this work, the mechanical properties and thermal conductivity of polyimide/graphite/ carbon fiber （CF） ternary composites were investigated. The synergistic effects between graphite and CF was studied with pseudo-binary system model. With increasing CF content, the tensile strength of PI/graphite/CF composite increased first and subsequently decreased. When the content of CF was 11.8 vol %, the tensile strength reached 66.37 MPa. The flexural strength of composite increased with increasing CF content. When the CF content was 24. 6 vol %, the flexural strength was 103. 3 MPa. The thermal conductivity of the composites increased nonlinearly, which indicated that graphite and CF had a synergistic effect. SEM indicated when the volume of CF was 34. 1%, thermally conductive pathway was formed by the crossover of CF and graphite resulting in a thermal conductivity of 0. 512 W/（m ·K）,which was two times of the calculated value.
出处
《中国塑料》
CAS
CSCD
北大核心
2009年第11期44-47,共4页
China Plastics
关键词
聚酰亚胺
碳纤维
石墨
热导率
力学性能
polyimide
carbon fiber
graphite
thermal conductivity
mechanical property
