【摘要】 研究用两亲性嵌段共聚物和纳米二氧化硅制备超疏水表面.采用可逆加成-断裂链转移聚合法(RAFT)合成了两亲性嵌段共聚物聚甲基丙烯酸叔丁酯-b-聚(4-乙烯基吡啶),用红外光谱,核磁共振,凝胶渗透色谱对聚合物进行了表征,将嵌段共聚物接枝到纳米二氧化硅上,形成一个有机无机杂化材料,通过调节pH值来控制杂化材料在水中的聚集行为,构筑了微纳双重结构的粗糙表面.该表面为超疏水表面,对水接触角达151°,滚动角<5°.扫描电镜分析表面形貌表明:具有微纳双重结构的类似荷叶表面是形成超疏水的根本原因.更多还原

【Abstract】 The present study demonstrates a superhydrophobic surface prepared by using amphiphilic block copolymers and nano silica.Amphiphilic block copolymer poly(tert-butyl methacrylate-b-4-vinylpyridine) was synthesized through RAFT(reversible addition-fragmentation chain transfer) polymerization.IR,1H NMR spectrum and GPC were utilized to characterize the chemical structures of the copolymer.The "grafting" approach was used to graft the amphiphilic block copolymer brushes of Poly(tert-butyl methacrylate-block-4-vinylpyridine) onto silica nanoparticles,and an organic-inorganic hybrid materials was formed,and then the aggregates of hybrid materials were controlled by regulating the pH value to construct a hierarchically textured coating on silicon wafer.The surface was a superhydrophobic surface,the contact angle on the suface of coating was 151°,and the sliding angle was below 5°.SEM analysis has shown that micro-nano dual structure is the root causes of the formation of the superhydrophobic surface.更多还原