成膜因素控制的SIS膜表面环境响应行为

发布时间：2018-05-03 05:17

本文选题：苯乙烯/异戊二烯/苯乙烯共聚物 + 环境响应性　；参考：《中国科学:化学》2017年10期

【摘要】：利用和频振动光谱、原子力显微镜及接触角技术研究了不同成膜溶剂、制膜方式所得苯乙烯/异戊二烯/苯乙烯嵌段共聚物(SIS)膜的表面结构及其对溶剂蒸气的响应行为.发现环己酮为溶剂的浇铸膜及甲苯为溶剂的旋涂膜表面润湿性随环己烷和丁酮蒸气交替处理发生变化;甲苯和环己烷为溶剂的浇铸膜表面性质不随溶剂蒸气处理而变化.原因是不同制样条件所获SIS膜具有不同的初始相分离结构.当聚合物膜形成远离平衡态的相分离结构时,分子聚集态转变的能垒较低,易于在溶剂蒸气诱导下转变为新的结构.反之,则不利于链构象转变,形成不同的聚集态结构.这将导致不同制备条件所得SIS膜经溶剂蒸气处理后形成不同的表面结构,呈现出各异的环境响应行为.本研究为智能界面材料的设计和制备提供了新思路.
[Abstract]:The surface structure of styrene / isoprene / styrene block copolymers prepared by different film forming solvents and their response to solvent vapor were studied by sum-frequency vibration spectroscopy atomic force microscopy and contact angle technique. It was found that the surface wettability of the cast film with cyclohexanone as solvent and the surface wettability of spin-coating film with toluene as solvent changed with the alternating treatment of cyclohexane and butanone vapor, while the surface properties of casting film with toluene and cyclohexane as solvent did not change with the treatment of solvent vapor. The reason is that the SIS membranes obtained by different sample preparation conditions have different initial phase separation structures. When the phase separation structure of polymer membrane is far from equilibrium state, the energy barrier of molecular aggregation state transition is lower, and it is easy to change into new structure under solvent vapor induction. On the contrary, it is not conducive to the chain conformation transition and the formation of different aggregates. This will result in the formation of different surface structure and environmental response behavior of SIS films prepared by solvent vapor treatment under different preparation conditions. This study provides a new idea for the design and preparation of intelligent interface materials.
【作者单位】：浙江理工大学化学系先进纺织材料与制备技术教育部重点实验室;浙江大学高分子科学与工程系;
【基金】：国家自然科学基金(编号:21504081,21374104,21674100) 浙江省自然科学基金(编号:LQ16B040001)资助项目
【分类号】：TB383.2

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