氧化石墨烯/二氧化硅协同改性环氧树脂复合材料的制备及表征  

Preparation and Characterization of Graphene Oxide/Silica Collaborative Modified Epoxy Resin Composites

作　　者：李善荣[1] 陆绍荣[1] 凌日华[1] 袁正凯[1] 祁博[1] 

机构地区：[1]桂林理工大学有色金属及材料加工新技术教育部重点实验室,广西桂林541004

出　　处：《高分子材料科学与工程》2013年第6期141-144,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51163004);广西自科科学基金资助项目(1298025-8;0842003-4A);广西科技攻关项目(0992022-4)

摘　　要：以氧化石墨烯(GO)、硅溶胶、甲苯二异氰酸酯为原料,合成二氧化硅接枝氧化石墨烯(SiO2-g-GO)化合物,并用于改性环氧树脂制备SiO2-g-GO/环氧树脂复合材料。采用红外光谱(FT-IR)、广角X射线衍射(WAXD)、热重分析(TGA)、动态机械分析仪(DMA)及扫描电镜(SEM)对复合材料性能进行表征。结果表明,当SiO2-g-GO用量为5 phr,材料冲击强度提高到38.79 kJ/m2,是纯环氧树脂的2.2倍左右;同时,拉伸强度、弯曲强度及弹性模量分别提高了1.35倍、1.45倍、1.42倍。TGA及DMA研究表明,改性后复合材料的起始分解温度、最大分解温度、储能模量和玻璃化转变温度Tg分别比环氧树脂有明显的提高。冲击断面的SEM表明,SiO2-g-GO对环氧树脂固化物有明显的增韧效果。The silica grafted graphene oxide （SiO2-g-GO） was synthesized using graphene oxide, silicon sol and toluene diisocynate as raw materials, and its reinforced epoxy composites were fabricated through ultrasonication and the cast molding method. The SiO2-g-GO/epoxy composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, dynamic mechanical analysis and scanning electron microscopy. The results show that the impact strength of composites increases to 38.79 kJ/m^2 and is about 2.2 times of that of the pure epoxy resin when the content of SiO2-g-GO is 5phr. Meanwhile, tensile strength, bending strength and elastic modulus increase by 1.35 times, 1.45 times, 1.42 times, respectively. The thermogravimetric and dynamic mechanical analysis indicates that the decomposition temperature, maximum decomposition rate, the storage modulus and glass transition temperature of the composites are improved. The SEM micrography of impact fracture shows that SiO2-g-GO of epoxy has the significant toughening effect.

关 键 词：二氧化硅 氧化石墨烯 环氧树脂 协同改性 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]