ABSTRACT

Graphene oxide (GO) nanoplatelets were functionalised using sulphonated polyethersulphone (PES-SO₃H) and subsequently as nanofiller incorporated into the PES matrix to improve its comprehensive performances. Influences of GO/PES-SO₃H nanoplatelets on the surface wettability, nanomechanical property and tribological behaviours of GO/PES-SO₃H/PES composite under various relative humidity were investigated. Test results indicate that the introduction of GO/PES-SO₃H dramatically decreases the water contact angles and increases the nanoindentation hardness of PES. The effects of relative humidity on the friction coefficients of GO/PES-SO₃H/PES composites are far less than that on the wear rates of PES composites. Compared with the pristine PES, the PES-matrix composite containing 1.0 wt-% GO/PES-SO₃H nanoplatelets exhibits the minimum friction coefficient (0.11) and wear rate (5.83×10−14 m³/N m) under the high relative humidity of 90%. This is attributable to the reinforcement effect and hydrogen bonding interaction of GO/PES-SO₃H nanoplatelets as well as the uniform and ultrathin PES self-lubricating transfer films.

摘要

氧化石墨烯 (GO) 纳米片使用磺化聚醚砜 (PES-SO ₃ H) 进行功能化，随后作为纳米填料掺入 PES 基质中以提高其综合性能。研究了GO/PES-SO ₃ H纳米片在不同相对湿度下对GO/PES-SO ₃ H/PES复合材料的表面润湿性、纳米力学性能和摩擦学行为的影响。测试结果表明，GO/PES-SO ₃ H的引入显着降低了水接触角并增加了 PES 的纳米压痕硬度。相对湿度对GO/PES-SO ₃摩擦系数的影响H/PES 复合材料的磨损率远低于 PES 复合材料。与原始 PES 相比，含有 1.0 wt-% GO/PES-SO ₃ H 纳米片的 PES-基体复合材料在高温下表现出最小摩擦系数（0.11）和磨损率（5.83×10-14 m ³ /N m）。相对湿度 90%。这归因于GO/PES-SO ₃ H 纳米片的增强效应和氢键相互作用以及均匀和超薄的PES 自润滑转移膜。