氧化石墨烯/白炭黑对硅橡胶力学性能的协同补强效应

Synergistic effect of graphene oxide/silica in enhancing the mechanical properties of silicone rubber

用机械共混的方法制备了SiO_2-氧化石墨烯(GO)/硅橡胶(MVQ)复合材料,研究了GO对SiO_2/MVQ体系的硫化过程、稳态、动态以及力学松弛性能的影响。结果表明,GO的引入一方面会提高填料网络对基体橡胶的物理补强效果,另一方面会延缓硅橡胶硫化交联速度,并降低最终的交联密度,削弱了化学补强效果。当GO的添加量为2Phr时,硅橡胶协同补强效果最佳,与只添加SiO_2的硅橡胶相比,100%定伸强度提高了37%,拉伸断裂强度提高了17%,断裂伸长率提高了8%,平台动态模量提高了115%。加入GO后,复合材料Payne效应及松弛效应均增大,从另一个角度反映了GO与SiO_2共同形成了物理补强效果更佳的填料网络。

SiO_2-Graphene oxide(GO)/silicone(MVQ)composites were prepared by mechanical mix method and the influence of GO on the vulcanization process,steady state,dynamic mechanical properties and relaxation of composites have been studied.The results showed that GO can improve the physical reinforcing effect of filler network,but weaken the chemical reinforcement effect by delaying the vulcanization crosslinking speed of silicone rubber and reducing crosslinking density.SiO_2-GO(40:2)/MVQ composites exhibited the best reinforcing effect,and compared with SiO_2/MVQ,the modulus at 100% strain,the tensile strength,the elongation at break and the dynamic modulus increased by 37%,17%,8%and 115%,respectively.After the introduction of GO,Payne effect and relaxation effect of composites became more obvious,which reflects that filler network,having better physical reinforcing effect,was formed by GO along with SiO_2.