原子转移自由基聚合制备端磺酸基PS及其与表面阳离子化的SiO2静电自组装研究  

Synthesis of Sodium Sulfonate Terminated Polystyrene by Atom Transfer Radical Polymerization and Studies on Electrostatic-assembly between Cationically Modified Silica and End-functionalized Polystyrene

作　　者：史博[1] 章永化[1] 石耀刚[2] 王建华[2] 

机构地区：[1]华南理工大学高分子系,广州510640 [2]中国工程物理研究院,绵阳621900

出　　处：《材料导报》2008年第9期119-121,124,共4页Materials Reports

基　　金：国家自然科学基金(批准号:10676009)资助

摘　　要：以2-溴异丁酸对磺酸基苯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与表面阳离子化的SiO2胶体(SiO2-CBAFS)进行静电组装,得到表面构筑了高分子刷的有机-无机纳米粉体及单层膜。采用红外、核磁表征了PS-SO3Na的结构,并用红外、热失重、接触角研究了组装体系的结构、组装量及表面行为。研究表明,采用2-溴异丁酸对磺酸基苯乙酯可以引发苯乙烯聚合得到PS-SO3Na,采用静电组装的方法可以成功地在表面阳离子化的SiO2-CBAFS上构筑组装量高达34.4%的高分子刷,并且高分子刷的表面水接触角达到75.3°;组装体系的组装量、表面水接触角均随聚合物溶液浓度的增加而下降;当外界环境不同时,其表面水接触角也发生相应的变化。Sodium sulfonate terminated polystyrene （PS-SO3Na） is synthesized by atom transfer radical poly- merization in which 2-bromoisobutyl p-sulfophenylethylate is used as initiator, and then reacted with NaOH. Polymer brushes constructed on the surface of cationically functionalized SiO2 （SiO2-CBAFS） or monolayer are prepared via electrostatic-assembly between PS-SO3 Na and SiO2-CBAFS. The structure of PS-SO3 Na is characterized by IR spectra and ^1HNMR; the characterized groups, the assembly amount and the appearance behaviors of the complex are studied by IR, TGA and water contact angles, respectively. The results show that PS-SO3 Na can be synthesized by the polymerization of styrene in which the initiator is 2-bromoisobutyl p-sulfophenylethylate; polymer brushes can be successfully constructed on the surface of SiO2-CBAFS with a high assembly amount by electrostatic-assembly. The assembly amount of polymer brushes on the surface of SiO2-CBAFS/PS-SO3 Na is 34. 4% and the water contact angle of Si/SiO2- CBAFS/PS-SO3 Na is 75.3°. the assembly amount and water contact angle of the complex decrease with the increase of the concentration of polymer solution,and the water contact angle of the complex changes with the environment.

关 键 词：静电自组装 端磺酸基聚苯乙烯 原子转移自由基聚合 阳离子化功能化 SIO2 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业] O631.5[理学—高分子化学]