To improve the thermo-oxidative aging resistance of natural rubber, a kind of functionalized graphene (FGE) was prepared by grafting 2-tert-butyl-6-(3-tertbutyl-2-hydroxy-5-methylphenyl) methyl-4-methylp-henyl acrylate (GM) onto graphene oxide (GO) using (3-mercaptopropyl) trimethoxysilane as bridging agent. In comparison to GO, FGE appeared more curled surface and reached the higher water contact angle of 134°. By latex-mixing method, the uniformly dispersed FGE endowed NR vulcanizates with obviously improved thermal stability. Importantly, the NR/FGE nanocomposites exhibitd excellent thermo-oxidative aging resistance, which was attributed to not only the synergistic antioxidative effect of hindered phenol groups and thioether bonds, but also the barrier role of graphene sheets to oxygen. Our findings provide a new strategy to prepare functionalized graphene as effective antioxidant for rubber and other polymer materials.

为了提高天然橡胶的抗热氧化老化性能，通过接枝2-叔丁基制备了一种功能化石墨烯（FGE）。使用（3-巯基丙基）三甲氧基硅烷作为桥连剂，将丙烯酸6-丁基（3-叔丁基-2-羟基-5-甲基苯基）甲基-4-甲基对苯酯（GM）转移到氧化石墨烯（GO）上。与GO相比，FGE出现了更多的卷曲表面，并达到了134°的更高的水接触角。通过乳胶混合法，均匀分散的FGE赋予NR硫化橡胶明显改善的热稳定性。重要的是，NR / FGE纳米复合材料表现出优异的抗热氧化老化性能，这不仅归因于受阻酚基团和硫醚键的协同抗氧化作用，而且还归因于石墨烯片层对氧气的阻挡作用。我们的发现为制备功能化石墨烯作为橡胶和其他聚合物材料的有效抗氧化剂提供了一种新策略。