表面改性对酚醛树脂／氧化石墨烯复合材料的力学性能与摩擦性能的影响

Effects of Modification on the Mechanical and Frictional Properties of PF/GO Composites

采用硅烷偶联剂KH550对氧化石墨烯(GO)进行表面改性,制备改性的氧化石墨烯(MGO),采用FTIR和XRD对MGO进行结构表征,通过共混、混炼、模压成型工艺制备酚醛树脂(PF)/MGO复合材料,研究GO的表面改性对PF复合材料的力学性能、动态力学性能和摩擦性能的影响,采用扫描电子显微镜(SEM)对复合材料的磨损表面进行形貌分析。结果表明:GO的表面改性对提高PF复合材料的力学和动态力学性能、摩擦学性能具有明显效果,相比于未改性的PF/GO复合材料,其冲击强度提高了24.32%,弯曲强度提高了10.95%,弯曲模量提高了21.21%,松弛模量提高了42.22%,形变率降低了40.79%,同时改性的PF/MGO复合材料具有较高的摩擦系数和磨损率;扫描电镜观察结果显示,复合材料的磨损表面显得平整、光滑。

Graphene oxide （GO） was modified by coupling agent KH550 to obtain modified graphene oxide （MGO）, the structure and properties of MGO were characterized by FTIR and XRD. MGO/PF composites were prepared by blending, mixing and molding preparation process. The effects of GO treatments on the mechanical properties, dynamic mechanical properties and friction properties of PF composites were studied, and the surface wear morphology was analyzed through SEM. The results show that： the surface modification has great effect on mechanical properties, dynamic mechanical properties and tribological properties of PF/MGO composites; compared with PF/GO composites, the impact strength, flexural strength, flexural modulus and relaxation modulus of PF/MGO composites increase by 24.32%, 10.95%, 21.21%, and 42.22% respectively, and the deformation rate decreases by 40.79%. The friction coefficient and wear ratio of PF/MGO composites improve obviously in comparison with PF/GO composites because of modification of GO. SEM result shows that the worn surfaces of PF/MGO composites is more even.