C_(60)共聚物旋涂膜的摩擦特性研究

Study on Friction Behavior of C_(60)-Copolymer Spin-coated Films Using Surface Force Apparatus

在云母基体上制备了含烷烃链的C60-苯乙烯(C60-PS)和含氟代烃链的C60-全氟代辛硫醇(C60-POTSF)2种C60共聚物旋涂膜,用原子力显微镜观察分析了C60共聚物旋涂膜的表面形貌,利用表面力仪研究了其摩擦力随速度和载荷变化的规律以及不同支链对C60共聚物旋涂膜摩擦性能的影响.结果表明:所制备的C60共聚物分子未发生聚集;当分子量相同时,含氟代烃支链的C60共聚物旋涂膜的摩擦性能优于含烷烃支链C60共聚物旋涂膜;含烷烃支链的C60共聚物旋涂膜的支链越长,其摩擦力越小,摩擦性能越好.

The thin films of two kinds of C60 derivatives with hydrocarbon (C60PS) and perfluorocarbon (C60POSTF) as the side chains, respectively, were prepared on mica making use of spincoating. The morphologies of the C60copolymer films were observed with an atomic force microscope, while the friction behavior of the films examined on a surface force apparatus. Results indicated that the C60 particulates were stably and relatively uniformly distributed in the copolymer deposited films. The frictionreducing behaviors of the C60copolymer films were largely dependent on the C60 particulates acting to reduce friction by 'microrolling effect'. Since the C60 particulates were more uniformly distributed in C60POSTF film, owing to the stronger interaction among the CH chains, it showed better frictionreducing ability than the C60PS film of the same molecular chain length.