Manufacture and properties of reduced graphene oxide/natural rubber-nitrile butadiene rubber composites
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摘要: 采用水合肼还原氧化石墨烯(GO)制备了还原氧化石墨烯(RGO),以RGO作为分散介质加入到天然橡胶(NR)和丁腈橡胶(NBR)基体中,通过乳液共混法制备了RGO/NR-NBR复合材料。采用FTIR、Raman、XRD及SEM等手段表征了RGO的结构和形貌,测试结果表明,水合肼还原GO效果较好,基本除去含氧官能团,同时RGO还保留了GO的片层结构。RGO/NR-NBR复合材料的SEM测试结果显示,纳米尺寸的RGO均匀分散在橡胶基体中,且复合材料的拉伸断面粗糙程度显著增加。RGO/NR-NBR复合材料的硫化性能测试结果表明,随RGO的含量增加,复合材料的交联密度、最大扭矩及扭矩差均增大。RGO/NR-NBR复合材料的力学性能随RGO含量的增加而提高,当RGO含量为3.0%时,材料的拉伸强度、100%定伸强度和邵氏硬度分别提高了65.7%、90.3%和21.1%,断裂伸长率降低了13.1%。
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关键词:
- 还原氧化石墨烯(RGO) /
- 天然橡胶(NR) /
- 丁腈橡胶(NBR) /
- 乳液共混 /
- 力学性能
Abstract: Reduced graphene oxide (RGO) was synthesized via chemical reduction of graphene oxide (GO) with hydrazine hydrate. By adding RGO in blending system of the natural rubber(NR) and nitrile butadiene rubber(NBR), the RGO/NR-NBR composites were prepared by latex co-coagulation method. The structure and morphology of RGO were analyzed by FTIR, Raman spectroscopy, XRD and SEM. The results show that oxygen functional group can be removed by the reduction of GO with hydrazine hydrate, meanwhile, RGO has maintained the monolayer structure of GO. SEM images of RGO/NB-NBR composites indicate that RGO is homogeneously dispersed in composites and the stretching section of composites becomes rough obviously. Analysis on vulcanization characteristics indicate that the cross-linking density, maximum torque and torque difference of the RGO/NR-NBR composite increase with the RGO mass fraction increasing. The mechanical properties of RGO/NR-NBR compsites have been greatly improved after the addition of RGO. When RGO/NR-NBR composites with 3.0% RGO, the tensile strength, tensile strength at 100% elongation and the shore A hardness of RGO/NR-NBR composites increase by 65.7%, 90.3% and 21.1%, respectively; the elongation at break decreases by 13.1%.
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