石墨烯/聚苯乙烯导热复合材料的制备

Preparation and Thermal Conductivity of G/PS Composites

以偶氮二异丁脒盐酸盐(AIBA)为引发剂,采用分散聚合的方法合成了表面带正电荷、粒径在600 nm的聚苯乙烯(PS)微球,通过自组装将氧化石墨烯包覆于PS微球表面,用化学还原法将氧化石墨烯还原为石墨烯,制备了石墨烯包覆聚苯乙烯微球的复合分散体和压制成型制备的石墨烯/聚苯乙烯导热复合材料。结果表明,随着初始氧化石墨烯投料量的增大,制备得到的石墨烯/聚苯乙烯复合材料的导热系数逐渐增大,投料量为20%时,复合材料的导热系数达到0.41 W/(m·K),相比纯PS本体提高了116%。

With 2, 2＇ - azobis [ 2 - methylpropionamidine ] dihydrochloride （AIBA） as an initiator, polystyrene （PS） micro beads with averaged size about 600 nm and positive charged surface were synthesized by dispersion polymerization. Graphene oxide （GO） was coated on the surface of PS beads （PS@ GO） by electrostatic self-assembly and then was reduced to graphene by chemical reduction. The graphene/ polystyrene （G/PS） composite film was prepared with the PS@ RG composite powder by compression. The structure of the PS beads and the reduction of GO were characterized. Results of thermal conductivity measurements for the G/PS composite films show that the thermal conductivity of G/PS composites increases with the increasing of initial graphene oxide content, and the thermal conductivity of the composites reaches to 0.41 W/（m · K）, over 2 fold-increase over the pure PS material.