耐高温GO/聚酰亚胺复合材料的制备及摩擦性能

Preparation and tribological properties of high temperature resistance graphene oxide /polyimide nanocomposites

通过溶液共混的方式制备出化学改性氧化石墨烯增强聚酰亚胺纳米复合材料。在干摩擦条件下,研究了氧化石墨烯的添加量对氧化石墨烯(GO)纳米片和γ-氨丙基三乙氧基硅烷改性氧化石墨烯(GO-Si)纳米片增强聚酰亚胺复合材料摩擦学性能的影响。结果表明,由0.5%GO-Si填充的PI复合材料的减摩和抗磨损性能明显优于GO增强的聚酰亚胺复合材料。此外,由扫描电镜(SEM)观察形貌显示,GO-Si在PI基体中分散均匀,而且GO-Si与PI高分子基体之间存在着较强的作用力,复合材料的磨损表面比较平滑。由热失重分析结果表明,GO-Si有效地提高了PI复合材料的热稳定性。

Chemically modified graphene oxide （ GO） reinforced polyimide nanocomposites were synthesized by means of the method of solution blending. The tribological behavior of the polyimide（ PI） composites were investigated under dry friction condition. The effects of the addition concentration on the friction and wear behavior of the composites filled with graphene oxide （ GO） nanosheets and isocyanate propyl triethoxysilane modified graphene oxide （ GO-Si） nanosheets were investigated. The results show that the friction-reduction and anti-wear performance of the PI composite filled with GO-Si is the most obvious, then the composite filled with GO is the next. Furthermore, scanning electron microscope （ SEM） investigation shows that GO-Si-filled PI composites has smooth worn surface under given applied load and sliding speed, and well-dispersed GO-Si in PI matrix provide a large surface area available for interaction between polymer molecules and GO-Si, which help to reduce the wear of PI composites. The thermal analysis indicates that the GO-Si can improve the thermal stability of the PI composites.