Controllable disintegration of temperature-responsive self-assembled multilayer film based on polybetaine

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• 作者：Zhangliang Gui^a ; Jinwen Qian^a ; Qiang Zhao^a ; Yanli Ji^a ; Yanxing Liu^a ; Tao Liu^a ; Quanfu An ; ^a ; ^{anqf@zju.edu.cn}
• 关键词：Polysulfobetaine ; Temperature-responsive ; Layer-by-layer self-assembly ; Controllable disintegration ; Free-standing multilayer film
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2011
• 出版时间：5 May 2011
• 年：2011
• 卷：380
• 期：1-3
• 页码：270-279
• 全文大小：1550 K

文摘

A layer-by-layer (LbL) self-assembly technique was used to construct temperature-responsive multilayer films of polybetaine poly-3-dimethyl(methacryloyloxyethyl) ammonium propane sulfonate (PDMAPS) and poly(acrylic acid) (PAA). The assembly and disintegration behaviors of PDMAPS/PAA multilayer films were investigated by quartz crystal microbalance (QCM) and atomic force microscopy (AFM). The results indicated that the assembly behaviors of PDMAPS/PAA multilayer films could be well regulated by the pH and temperature of dipping solutions. The disintegration of PDMAPS/PAA multilayer films could be well controlled by varying the disintegration temperature (T_d) and the pH of buffer solution. The critical disintegration temperature (T_cd) decreased with increasing pH of buffer solution used. The ionization of carboxylic acid groups (COOH) of PAA and the breakage of intra-chain associations of PDMAPS in multilayer films are two main reasons for the film disintegration. Based on the controllable disintegration of the PDMAPS/PAA multilayer, free-standing multilayer films were successfully prepared by LbL self-assembly of poly(4-vinylpyridiniomethanecarboxylate) (PVPMC) and PAA using PDMAPS/PAA as a sacrificial sublayer.