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用KH-550对氧化石墨进行改性,再对其进行还原,获得功能化石墨烯(FG),未经干燥的FG经超声处理后可以稳定分散在质量比9∶1的丙酮/水混合液中;在高速搅拌和超声分散条件下,将FG分散液分散到室温硫化(RTV)硅橡胶中,固化后得到纳米FG(nano-FG)/RTV硅橡胶复合材料。采用FTIR、TEM、SEM、XRD和DSC分析了FG及复合材料的结构和形貌。结果表明:KH-550连接到石墨烯片层表面上,使其片层起皱、折叠,部分发生了剥离,层间距增大到3.46A°;FG经过超声处理后剥离成透明至半透明的片层;nano-FG/RTV硅橡胶复合材料的断面结构为褶皱结构,不同于纯硅橡胶,也未出现微观相分离;与硅橡胶相比,复合材料的Tg、Tm和结晶度均有所提高。复合材料的力学性能测试结果表明,nano-FG对RTV硅橡胶具有明显的补强效果,当nano-FG质量分数为0.5%时,nano-FG/RTV硅橡胶复合材料的拉伸强度比纯RTV硅橡胶提高了一倍多,达到了0.43 MPa;断裂伸长率也提高了52%,达到了265%。
The graphite oxide was modified with KH-550 and then reduced to obtain functionalized graphene (FG). The undried FG was sonicated and stably dispersed in a 9: 1 acetone / water mixture ; Under the conditions of high speed stirring and ultrasonic dispersion, the FG dispersion is dispersed into a room temperature vulcanization (RTV) silicone rubber to obtain nano-FG (nano-FG) / RTV silicone rubber composite after curing. The structure and morphology of FG and its composites were analyzed by FTIR, TEM, SEM, XRD and DSC. The results showed that KH-550 was connected to the surface of graphene sheet, which caused the sheet to wrinkle, fold and partially peel off. The interlayer spacing increased to 3.46A °. The FG was sonicated to be transparent to translucent The cross-sectional structure of the nano-FG / RTV silicone rubber composites is a wrinkled structure, which is different from the pure silicone rubber and does not appear microscopic phase separation. Compared with the silicone rubber, the Tg, Tm and crystallinity of the composites are both improve. The mechanical properties of the composites show that the nano-FG has obvious reinforcing effect on RTV silicone rubber. When the mass fraction of nano-FG is 0.5%, the tensile strength of nano-FG / RTV silicone rubber composites is higher than pure RTV Silicone rubber more than doubled to 0.43 MPa; elongation at break increased 52% to 265%.