氧化石墨烯/天然橡胶-丁腈橡胶复合材料的制备与性能

为研究氧化石墨烯（GO）对共混橡胶的补强改性作用，首先，通过改进的Hummers方法制备了GO，并通过乳液共混法制备了GO/天然橡胶（NR）-丁腈橡胶（NBR）复合材料；然后，采用SEM、FTIR、XRD、溶胀测试和力学性能测试表征了GO、NR-NBR硫化胶和GO/NR-NBR复合材料的微观形态、结构和力学性能。结果表明:所得GO含有大量的含氧官能团，氧化效果较好；橡胶基体中GO分散均匀，且GO/NR-NBR复合材料的拉伸断面粗糙程度显著增加；GO的填充可以提高复合材料的表观交联密度；GO/NR-NBR复合材料的力学性能随着GO含量的增加而改善，当GO含量为3.0wt%时，GO/NR-NBR复合材料的拉伸强度、100%定伸应力和邵氏A硬度分别提高了53.3%、67.3%和10.5%，断裂伸长率降低了9.6%。 

Manufacture and properties of graphite oxide/natural rubbernitrile-butadiene rubber composites

In order to investigate the reinforcement and modification effects of graphite oxide (GO) on blending rubber, GO was synthesized by modified Hummers method, and GO/natural rubber (NR)-nitrile-butadiene rubber (NBR) composites were fabricated by latex co-coagulation technology firstly. Then, SEM, FTIR, XRD, swelling tests and mechanical property tests were employed to characterize the morphologies, structures and mechanical properties of GO, NR-NBR vulcanized rubber and GO/NR-NBR composites. The results show that the GO obtained contains a large amount of oxygen-containing functional groups, the oxidation effect is good; GO is homogeneously dispersed in rubber matrix, and the roughness of stretching section for GO/NR-NBR composites improves obviously. The apparent cross-linking density of the composites increases for the filling of GO. The mechanical properties of GO/NR-NBR composites improve with GO content increasing. When GO content is 3.0wt%, the tensile strength, tensile stress at 100% and Shore A hardness of GO/NR-NBR composites increase by 53.3%, 67.3% and 10.5%, respectively, and the elongation at break decreases by 9.6%.