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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.
The surface structures of styrene / isoprene / styrene block copolymer (SIS) membranes obtained by different film-forming solvents and membrane-forming methods were studied by means of frequency vibrational spectroscopy, atomic force microscopy and contact angle techniques, The results show that the surface wettability of spin-coated films with cyclohexanone as solvent and toluene as solvent changes with the alternating treatment of cyclohexane and methyl ethyl ketone vapor. The surface properties of the cast films with toluene and cyclohexane as solvent do not follow Solvent vapor treatment because the SIS films obtained by different sample preparation conditions have different initial phase separation structures.When the polymer film forms a phase separation structure far from the equilibrium state, the energy barrier of molecular aggregation state transition is low, Solvent vapor-induced transformation into a new structure.On the contrary, it is not conducive to the chain conformational transitions to form different aggregated state.This will result in different preparation conditions obtained SIS film by solvent vapor treatment to form a different surface structure, showing different Environment response behavior.This study provides a new idea for the design and preparation of smart interface materials.