改性石墨烯纳米带/双马来酰亚胺复合材料的摩擦学性能

Tribological properties of modified graphene anoribbon/bismaleimide composites

为了改善石墨烯与双马来酰亚胺(BMI)树脂的相容性,并使其在摩擦过程中快速形成高质量自润滑转移膜,用超支化聚硅氧烷(HBPSi)和Ni纳米粒子共同改性石墨烯纳米带(GNRs),制备了HBPSi/Ni/GNRs复合粒子,将其引入到BMI树脂中制备出HBPSi/Ni/GNRs/BMI复合材料。采用FTIR、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、形貌及添加量和复合材料的摩擦学性能的影响进行了考察,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表面上。与GNRs相比,HBPSi/Ni/GNRs复合粒子能够显著提升BMI复合材料的摩擦学性能。当HBPSi/Ni/GNRs复合粒子添加量(质量分数)为0.6%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,分别为0.18和1.9×10^(-6)mm^(3)/(N·m)。HBPSi/Ni/GNRs复合粒子与BMI树脂强的界面作用是导致其复合材料抗剪切能力提升的关键。

In order to improve the compatibility of graphene with bismaleimide(BMI)resin and enable it to rapidly form high-quality self-lubricating transfer films during friction.HBPSi/Ni/GNRs/BMI composites were synthesized by combination of BMI resin with HBPSi/Ni/GNRs composite particles,which were obtained from modification of graphene nanoribbons(GNRs)by hyperbranched polysiloxane(HBPSi)and Ni nanoparticles.The influence of structure,morphology and addition amount of the composite particles on the tribological properties of the composites were analyzed by FTIR,SEM,TEM,tribological wear testing machine and molecular dynamics simulation,with further evaluation on their friction and wear mechanism.The results showed that HBPSi and Ni nanoparticles were successfully loaded onto the surface of GNRs,while HBPSi/Ni/GNRs composite particles significantly improved the tribological properties of BMI composites compared with GNRs.When addition amount(mass fraction)was 0.6%,the friction coefficients and volume wear rate of the HBPSi/Ni/GNRs/BMI composites reached the lowest values of 0.18 and 1.9×10^(-6)mm^(3)/(N·m),respectively.The strong interfacial interaction between HBPSi/Ni/GNRs composite particles and BMI resin was the key to enhance the shear resistance of its composites.