Abstract: 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.

Key words: EP composite, BN, thermal conduction, electrical property