超支化聚硅氧烷/Ni/石墨烯纳米带/BMI复合材料的摩擦学性能研究

Tribological properties of hyperbranched polysiloxane /Ni/ graphene nanoribbon /BMI composites

摘要:

为了改善石墨烯与双马来酰亚胺(BMI)树脂基体的相容性并使其在摩擦过程中快速形成高质量自润滑转移膜,本文以超支化聚硅氧烷(HBPSi)和纳米Ni粒子共同改性石墨烯纳米带(GNRs)制备出HBPSi/Ni/GNRs复合粒子,并将其引入BMI树脂中制备出HBPSi/Ni/GNRs/BMI复合材料。采用FT-IR、SEM、TEM、摩擦磨损试验机及分子动力学模拟对复合粒子的结构、形貌及引入量和复合材料的摩擦学性能的影响进行了研究,并探究了其摩擦磨损机理。结果表明：HBPSi和Ni纳米粒子成功负载到GNRs表面。HBPSi/Ni/GNRs相比于GNRs能够显著提升其BMI复合材料的摩擦学性能。当HBPSi/Ni/GNRs添加量为0.6 wt%时,HBPSi/Ni/GNRs/BMI复合材料的摩擦系数和体积磨损率均降至最低值,分别为0.18和1.9×10_-6 ^mm₃^/(N.m)。此外,分子动力学结果表明,HBPSi/Ni/GNRs与BMI强的界面作用是导致其复合材料抗剪切能力提升的关键。

Abstract:

In order to improve the compatibility of graphene with bismaleimide (BMI) resin matrix and to enable the rapid formation of high-quality self-lubricating transfer films during friction. This paper prepared HBPSi/Ni/GNRs com-posite particles by comodifying graphene nanoribbons (GNRs) with hyperbranched polysiloxane (HBPSi) and Ni nanoparticles, and introduced them into BMI resin to prepare HBPSi/Ni/GNRs/BMI composites, and introduced them into BMI resin to prepare HBPSi/Ni/GNRs/BMI composites. FT-IR, SEM, TEM, tribological wear testing ma-chine and molecular dynamics simulation were used to investigate the effects of the structure, morphology and in-troduction of the composite particles and the tribological properties of the composites, and the tribological wear mechanism was investigated. The results showed that HBPSi and Ni nanoparticles were successfully loaded onto the surface of GNRs. HBPSi/Ni/GNRs were able to significantly improve the tribological properties of their BMI composites compared to GNRs. When the filler addition is 0.6 wt%, the friction coefficients and volume wear rate of the HBPSi/Ni/GNRs composites reach their lowest values of 0.18 and 4.5×10-6 mm3/(N.m), respectively. In ad-dition, the molecular dynamics results indicate that the strong interfacial interaction between HBPSi/Ni/GNRs and BMI is the key leading to the enhanced shear resistance of their composites.