聚苯乙烯/还原氧化石墨烯核壳微球的制备及性能表征

Preparation and Properties of Polystyrene-graphene Core-shell Microspheres

摘要:

以阳离子聚苯乙烯微球（PS）为核，氧化石墨烯（GO）和PS之间通过静电和π-π作用力进行静电自组装，制备得到聚苯乙烯/氧化石墨烯核壳微球（PS/GO），然后采用氢碘酸（HI）进行还原得到聚苯乙烯/还原氧化石墨烯核壳微球（PS/rGO），采用XRD、SEM、TEM对PS/GO和PS/rGO进行结构表征。探究了自组装过程条件对核壳微球形貌的影响，对影响壳层GO含量的搅拌和超声条件、反应时间、GO浓度进行了考察。对不同壳层rGO（还原氧化石墨烯）厚度的PS/rGO复合材料进行了导电性能和热稳定性测试，结果表明，改变壳层rGO的含量，会直接影响复合材料的导电和热性能。由于PS/rGO具有独特的核壳结构，其导电性能和热稳定性相比PS有所提高，电子电阻从PS的17.3 Ω降到了PS/rGO的8.34 Ω，PS/rGO的起始热分解温度提高了近120 ℃。

Abstract:

We prepared the polystyrene/graphene oxide core-shell microspheres (PS/GO) based on the self-assembly between graphene oxide sheet (GO) and cationic polystyrene microspheres (PS) through electrostatic and π-π attraction between them and the PS/GO were reduced by hydroiodic acid (HI) to obtain the polystyrene/reduced graphene oxide core-shell microspheres (PS/rGO), which were characterized byXRD, SEM and TEM. It was found that the thickness of shell GO was influenced by ultrasonic and mechanical stirring, self-assembly time and GO concentration. The PS/rGO composites with different amount of shell rGO were characterized by conductivity and thermal stability measurements and the results show that the shell rGO will directly affect its conductivity and thermal properties. Besides, the conductivity and thermal stability of PS/rGO were improved compared to PS due to the special core-shell structure: the electronic resistance of PS (17.3 Ω) were down to 8.34 Ω (PS/rGO) and the initial thermal decomposition temperature of PS/rGO were increased by nearly 120 ℃.