机械共混法制备改性氧化石墨烯/天然橡胶复合材料及性能表征

Preparation and Characterization of Modified Graphene Oxide/Natural Rubber Composite by Mechanical Mixing Method

采用Hummers法制备氧化石墨烯(GO),用硅烷偶联剂γ―氨丙基三乙氧基硅烷(KH-550)对氧化石墨烯进行改性,得到改性氧化石墨烯(MGO),并用红外光谱、X射线衍射仪和扫描电镜对其进行表征分析。用机械共混的方法制备MGO/天然橡胶(NR)复合材料,研究了MGO/NR复合橡胶的力学性能、动态性能以及动态生热性能,并与GO/NR复合材料性能对比。结果表明,经KH-550改性后的氧化石墨烯能有效地去除部分亲水基团,改善其在天然橡胶中的分散性。随着MGO用量的增加,复合材料的力学性能有所提高,损耗因子和动态温升均有所提高,Payne效应增大。

Firstly, the method of Hummers was used to obtain graphene oxide. Then the modified graphene oxide （MGO） was prepared by treating graphene oxide with 7-aminopropyl triethoxysilane （KH-550）. The MGO was characterized by FT-IR, XRD and SEM. The MGO/natural rubber （NR） composites were prepared by mechanical mixing method. Properties of MGO/NR composites in mechanical properties, dynamic properties and dynamic heat generation were investigated and compared with the properties of GO/NR composites. The results show that parts of hydrophilic groups of graphene oxide are eliminated effectively by KH-550. It is account for that the dispersity of graphene oxide in nature rubber is improved. When the amounts of MGO increase, the mechanical property, tanδ and dynamic heat generation of the composites are enhanced, meanwhile, the Payne-effect is also obvious.