活性端基聚苯乙烯表面修饰膜的制备与摩擦学性能  

PREPARATION AND TRIBOLOGICAL PROPERTIES OF SELF-ASSEMBLED POLYSTYRENE FILM

作　　者：周峰[1] 李斌[1] 陈淼[1] 刘维民[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000

出　　处：《高分子学报》2002年第5期608-612,共5页Acta Polymerica Sinica

基　　金：国家杰出青年基金 (基金号 5 982 5 116)项目

摘　　要：以巯丙基三甲氧基硅烷为链转移剂 ,利用自由基聚合反应合成了三甲氧基硅烷封端的聚苯乙烯 ,研究了其在单晶硅基底上的自组装行为 ,并用红外、X射线光电子能谱、原子力显微等对膜进行了表征 .研究发现 ,聚合物的浓度大于 1mg mL时才能形成较完整的聚合物膜 ,均方根粗糙度低于 1nm ,自组装过程在 90℃时 1h内即可完成 .与空白基底相比 ,自组装聚苯乙烯膜具有良好的减摩抗磨性能 ,稳定摩擦系数为 0 12 .A method for chemically attaching ultra-thin polymer films through the self-assembly of end silane terminated polymer is provided in this article. End trimethoxysilane functionalized polystyrene (PSt) was first prepared through radical chain transfer reaction and characterized by FTIR, H-1-NMR and gel permeation chromatography (GPC) The coincidence of the calculated molecular weight of the prepared end silane terminated PSt from both GPC and NMR proved high end functionalized ratio. The self-assembly behavior on silicon wafers of the obtained polymer was studied by measuring the contact angle, film thickness. The chemical characteristics and the nano scale morphology of the film were investigated with FTIR, X-ray photoelectro spectroscopy (XPS) atomic force microscopy (AFM) It was found that homogeneous and complete polymer film could be formed only when the polymer concentration exceeded 1 mg/mL. The root mean roughness of the complete polymer was below I rim. The tribological properties of the prepared PSt film were investigated using a static-dynarnic friction precision measurement apparatus. The friction coefficient of self-assembled PSt film against steel ball at a load of 0.5 N was in the range of 0.08similar to0.1 which was much lower than that for bare silicon wafers in the same experiment conditions (0.7similar to0.8). Self assembled PSt modified silicon wafers exhibited excellent friction reduction and anti-wear behavior comparing with their bare counterparts. According to this investigation, self-assembled polymer films have the prospect for friction reduction and wear resistance.

关 键 词：表面修饰膜 制备 摩擦学性能 自组装聚合物膜 聚苯乙烯 链转移反应 摩擦学 

分 类 号：O632[理学—高分子化学]