氧化石墨烯/PMMA复合材料的制备与表征

Preparation and Characterization of Oxidized Graphene/PMMA Hybrid Materials

以石墨粉为原料,根据改进的Hummers氧化法制得氧化石墨烯,利用氧化石墨烯表面富集的羧基与乙二醇和酰氯化的4,4′-偶氮(4-氰基戊酸)的反应,进一步得到氧化石墨烯表面负载的4,4′-偶氮(4-氰基戊酸),以此为引发剂,通过自由基聚合制备了氧化石墨烯-聚甲基丙烯酸甲酯(oxidized graphene-g-PMMA)杂化材料.采用红外(FT-IR)、透射电镜(TEM)和原子力显微镜(AFM)对产物的结构和形貌进行了表征,并研究了频率依赖下的样品的电学性能.结果表明,PMMA已在氧化石墨烯表面接枝,石墨烯-聚甲基丙烯酸甲酯杂化材料的导电率及介电常数较氧化石墨烯分别降低了0.098S.cm-1和34 000.

Oxidized graphene was obtained via modified Hummers′s method with graphite as raw material.Then the carboxyl of oxidized graphene reacted with glycol and 4,4′-azobis（4-cyanopentanoic acid chloride） successively and resulted in oxidized graphene supported 4,4′-azobis（4-cyanopentanoic acid）.The oxidized graphene-g-poly（methyl methacrylate）（oxidized graphene-g-PMMA） hybrid material was successfuly prepared using oxidized graphene supported 4,4′-azobis（4-cyanopentanoic acid） as initiator and methyl methacrylate as the monomer.The structure and the configuration of the samples were characterized by fourier transform infrared（FT-IR） spectroscopy,transmission electron microscopy（TEM） and atomic force microscopy（AFM） respectively.The electrical properties depended on frequency was also researched.The results show that the PMMA had grafted from the oxidized graphene surface,the electrical conductivity and the dielectric constant of oxidized graphene-g-PMMA hybrid material decreased 0.098 S·cm-1 and 34 000 respectively compared with oxidized graphene.