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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%。
In order to study the effect of graphene oxide (GO) on the reinforcement of blends, first, GO was prepared by a modified Hummers method and GO / natural rubber (NR) - nitrile rubber NBR) composites. The microstructure, structure and mechanical properties of GO, NR-NBR vulcanizates and GO / NR-NBR composites were characterized by SEM, FTIR, XRD, swelling test and mechanical properties. The results show that the obtained GO contains a large amount of oxygen-containing functional groups and the oxidation effect is good. The GO dispersion in the rubber matrix is uniform and the tensile cross-section roughness of GO / NR-NBR composites increases significantly. The mechanical properties of GO / NR-NBR composites improved with the increase of GO content. The tensile strength and tensile modulus of GO / NR-NBR composites with GO content of 3.0 wt% And Shore A hardness increased by 53.3%, 67.3% and 10.5%, respectively, and the elongation at break decreased by 9.6%.