GRAFTING OF POLY(SODIUM STYRENESULFONATE) ONTO GOLD SURFACE FROM NaNO_3 SOLUTION

查看全文 作　　者：Iram [1]Bibi;Mohammad [1]Siddiq 机构地区：[1]Department of Chemistry,Quaid-i-Azam University Islamabad 45320,Pakistan 出　　处：《Chinese Journal of Polymer Science》索引2011年第29卷第5期,共5页 基　　金：financially supported by the Higher Education Commission(HEC) of Pakistan under the indigenous PhD scholarship program 摘　　要：The chemical grafting of thiol terminated poly(sodium styrenesulfonate)(HS-PSSS) chains from sodium nitrate (NaNO3) salt solution to a gold surface was investigated with a quartz crystal microbalance with dissipation monitoring (QCM-D) in different salt concentrations.It was found that at low salt concentration grafting density of HS-PSSS was low and the grafted chains adopted a mushroom conformation.With the increase of salt concentration polyelectrolyte chains underwent a transition toward coiled state due to reduction of electrostatic repulsion and as a result more chains were grafted on the surface.When the grafting density reached a certain limit after which further grafting caused repulsion between already grafted HS-PSSS chains and as a result grafted chains adopted a brush conformation. 关 键 词：表面接枝 硝酸钠 盐溶液 苯乙烯 金表面 石英晶体微天平 盐分浓度 聚电解质