原子转移氮氧自由基偶合反应制备聚苯乙烯改性的石墨烯

• 作 者: 陈小乙 石远琳 杨东 胡建华 杨艽原
• 机 构: 聚合物分子工程国家重点实验室复旦大学高分子科学系,上海200433／复旦大学化学系,上海200433;聚合物分子工程国家重点实验室复旦大学高分子科学系,上海,200433;复旦大学化学系,上海,200
• 出 处: 化学学报
• 发表日期: 2012年7期
• 关键词: graphene polystyrene atom transfer nitroxide radical coupling reaction chemical

通过原子转移氮氧自由基偶合（ATNRC）反应制备了聚苯乙烯改性的石墨烯．先将氧化石墨烯酰氯化，然后与2,2，6，6．四甲基．4．羟基哌啶．1．氧自由基（HTEMPO）进行酯化反应制备HTEMPO修饰的石墨烯（Graphene．HTEMPO），通过Graphene．HTEMPO与原子转移自由基聚合（ATRP）方法制备的Br封端的聚苯乙烯进行ATNRC反应，即可得到聚苯乙烯共价改性的石墨烯（Graphene-g-PS）．热失重分析结果表明聚苯乙烯的接枝率约为6．68wt％，从透射电镜照片中也可以明显地看到石墨烯表面的聚苯乙烯．由于聚苯乙烯的共价接枝，使得Graphene-g-PS在氯仿、正己烷、甲苯、甲醇等有机溶剂中具有很好的分散性，有利于石墨烯的进一步应用．“,”Polystyrene functionalized graphene was prepared by atom transfer nitroxide radical coupling （ATNRC） reaction. Graphene oxide was first reacted with thionyl chloride, followed by esterification with 4-hydroxy-2,2,6,6-tetramethyl-piperidinyl-1-oxyl （HTEMPO） to prepare HTEMPO functionalized graphene （Graphene-HTEMPO）. Then, Graphene-HTEMPO was coupled with Br-end-capping polystyrene prepared by atom transfer radical polymerization （ATRP） via ATNRC reaction to obtain polystyrene covalently func- tionalized graphene （Graphene-g-PS）. The thermogravimetric analysis result showed that the graft ratio of PS was 6.68 wt%. The PS on the surface of graphene could be obviously observed from the TEM image. Because of the covalent graft of PS, Graphene-g-PS showed good dispersibility in chloroform, hexane, tolu- ene, methanol, etc., which is favorable to the further application of graphene.