不同粒径氮化硼填充环氧树脂/玻璃纤维绝缘导热复合材料的研究

EP/GF Insulating and Thermally Conductive Composite Materials Filled with Different Sizes of BN

以聚砜改性环氧树脂为基体,通过高温模压制备了环氧树脂/玻璃纤维/氮化硼复合材料,研究了不同粒径及不同氮化硼导热粒子用量对复合材料导热性能、力学性能和电性能的影响。结果表明,大粒径粒子有利于复合材料力学性能的提高,小粒径有利于导热性能的提高;随着氮化硼用量的增加,复合材料的导热性能升高,力学性能呈现先增后降趋势,当氮化硼用量为10%(质量分数,下同)时,复合材料的冲击强度和弯曲强度均达到最佳,当氮化硼用量为20%时,复合材料仍保持较好的电性能。

A thermally conductive composite was prepared using polysulfone modified epoxy resin as a matrix, glass fiber as a reinforcer, and boron nitride（BN） as a thermally conductive filler. It was found that the BN of large particle size could improve the mechanical strength, and those of small particle size was beneficial to a high thermal conductivity. With increasing content of BN particles, the thermal conductivity increased, the impact and flexure strengths increased first, and then decreased. When the content of BN was 10 wt ~, impact and flexure strengths reached the maximum values.