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以对2-溴异丁酸-2′-(对磺苯基)乙酯为引发剂引发苯乙烯发生原子转移自由基聚合,得到的聚合物与NaOH反应转化为端基为磺酸钠的PS(PS-SO3Na).然后采用静电组装方法将PS-SO3Na与表面正离子化的SiO2胶体(SiO2-CBAFS)进行静电组装,得到表面构筑了高分子刷的SiO2胶体/粉体.采用IR、1H-NMR、TG、TEM、AFM、GPC和表面水接触角对组装体系进行结构表征、组装量和部分组装规律研究.结果表明,采用对2-溴异丁酸2′-(对磺苯基)乙酯为引发剂可以制备完全端磺酸基的PS-SO3Na,并且采用静电组装法在SiO2颗粒表面可构筑组装量高达34.4%的高分子刷,有效的提高了高分子刷的组装量;TEM观察下在SiO2胶体颗粒外围可见白色晕圈,PS-SO3Na刷的存在明显改善了SiO2胶体颗粒的分散状态;当样品润洗溶剂由THF变换为H2O时,自组装单层膜的表面水接触角下降幅度小于4°;综合TG、AFM和表面水接触的测试结果发现,用于组装的PS-SO3Na分子量介于1.5×104～3.6×104时,溶液浓度介于2.5×10-5～5×10-5mol/L时,SiO2颗粒具有较好的表面修饰效果.
In order to initiate the atom transfer radical polymerization of styrene by using 2-bromoisobutyric acid-2 ’- (p-sulfophenyl) ethyl ester as initiator, the resulting polymer was reacted with NaOH to convert it into sodium sulfonate PS (PS-SO3Na) .Then the PS-SO3Na and the cationized SiO2 colloid (SiO2-CBAFS) were electrostatically assembled by electrostatic assembly method to obtain SiO2 colloidal powder with polymer brush on the surface. IR, 1H (2-bromoisobutyric acid) 2 ’- (p-sulfophenyl) -2-bromoisobutyric acid was investigated by means of IR, NMR, TG, TEM, AFM, GPC and surface water contact angles. Ethyl methacrylate as initiator can be used to prepare PS-SO3Na with complete terminal sulfonic group. Electrostatic assembly method can be used to build high-molecular-weight polymer brushes with an assembly volume of 34.4% on the surface of SiO2 particles. The presence of PS-SO3Na brush significantly improved the dispersion state of SiO2 colloidal particles. When the sample rinsing solvent was changed from THF to H2O, the surface water contact angle of self-assembled monolayer film Less than 4 ° decline; Comprehensive TG, AFM and surface water contact test results When now, when the molecular weight of the PS-SO3Na for assembling is between 1.5 × 104 ~ 3.6 × 104, concentration of the solution is between 2.5 × 10-5 ~ 5 × 10-5mol / L, SiO2 particles have a better surface modification effect.