端基结构对超支化聚合物静电吸附自组装行为的影响

Effect of the End-group Structure of Hyperbranched Polymers on Their Electrostatic Self-assembly Behavior

研究了 3种具有相同骨架结构、不同端基的超支化聚合物与线型聚阳离子 ( PDAC)的静电吸附自组装 .结果表明 ,超支化聚合物的组装过程与线型弱酸聚合物相似 ,都受溶液 p H值与无机盐浓度的影响 ,但影响程度随端基结构不同而变化 .此外 ,对以超支化聚合物为最外层的不同自组装膜的表面形貌及接触角进行了表征 ,其表面形貌及亲水性随端基结构的不同而不同 .

The electrostatic adsorption self-assembly behavior of three anionic hyperbranched polymers with the same backbone but different end-groups in the presence of poly(diallyldimethylammonium chloride)(PDAC) were investigated. The three hyperbranched polyanions all showed good self-assembly properties and the increase of bilayers were monitored by UV-Vis spectra. Similar to the linear weak polyanions, their self-assembly were much affected by the solution conditions, such as pH value and salt concentration. However, these behavior under different solution conditions was also controlled by the variation of their end-group structures. Furthermore, the surface morphology and the contact angle for water of the self-assembly film with hyperbranched polymers as the out-layer were also affected by the variation of end-group strutures of these polymers.