摘要
以硅烷偶联剂改性的氧化铝为导热填料,聚酰亚胺改性环氧树脂为基体,通过高温模压法制备了Al2O3填充聚酰亚胺/环氧导热玻纤复合材料,研究Al2O3和聚酰亚胺含量对复合材料热性能、力学性能和介电性能的影响。结果表明,复合材料的热导率随着纳米Al2O3粒子含量的增加而增加。当Al2O3粒子的填充量为50%时,复合材料的热导率可达1.239W/(m.K)。复合材料冲击强度和弯曲强度随粒子含量的增加呈先增加后降低趋势,当Al2O3粒子的填充量为20%时,材料的冲击强度为376.3kJ/m2,弯曲强度为912.6MPa。聚酰亚胺改性的复合材料具有较好的介电性能、热稳定性和耐热老化性。
Thermally conductive composite reinforced by glass fiber was prepared by heat-press molding, using polyimide modified epoxy resin as a matrix, alumina modified by KH-550 as thermal conductive filler. The thermal, mechanical, and dielectric properties were studied. It showed that thermal conductivity of the composites increased with increasing content of A1A12O3. When the content of AA12O3 reached 50%, the thermal conductivity was up to 1. 239 W/（m·K）. The impact and bend strengths increased first then decreased. When the content of A12O3 was 20%, the ultimate values were 376.3 kJ/m^2 and 912.6 MPa, respectively. The composites modified using polyimide possessed good dielectric properties, thermal stability, and thermal aging resistant.
出处
《中国塑料》
CAS
CSCD
北大核心
2013年第2期51-55,共5页
China Plastics
关键词
环氧树脂
聚酰亚胺
氧化铝
玻纤增强
热导率
epoxy resin
polyimide
alumina
glass fiber reinforcement
thermal conductivity
