成膜因素控制的SIS膜表面环境响应行为  

Environmental adaptivity of the surface of styrene-isoprene-styrene tri-block copolymers films controlled by the film-preparation kinetics

作　　者：左彪[1] 刘悦 常帅锋 陈天宇[1] 王新平[1] 姚炎庆 沈之荃[2] Biao Zuo Yue Liu Shuaifeng Chang Tianyu Chen Xinping Wang Yanqing Yao Zhiquan Shen(Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Department of Chemistry, Zhejiang Sei-Tech University, Hangzhou 310018, China Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China)

机构地区：[1]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,杭州310018 [2]浙江大学高分子科学与工程系,杭州310027

出　　处：《中国科学：化学》2017年第10期1208-1217,共10页SCIENTIA SINICA Chimica

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

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.The responses of the surface structures to the solvent vapor treatment for the films of styrene（S）/isoprene（I）/styrene（S） tri-block copolymers（SIS） prepared by various casting solvents and film-formation methods（solvent-casting and spin-coating） were investigated by contact angle measurement, atomic force microscopy（AFM）and sum frequency generation vibrational spectroscopy（SFG）. It was shown that the surface wettability of the SIS solvent-cast films（cyclohexanone as solvent） and spin-coated films（toluene as solvent） exhibited the reversibly switching properties, if alternately exposed them to the vapor of PI-selective（cyclohexane） and PS-selective（butanone）solvents. However, for the solvent-cast films prepared by cyclohexane and toluene solution, the wettability of the films surface did not change, regardless of which solvent was applied in vapor treatment. It was claimed that the difference in the phase-separation structure of the SIS films prepared using different casting solvents and film-formation methods is the main reason for the discrepancy in the surface adaptive behavior. If the films have the equilibrium phase structures, the energy barrier for the conformation adjustment is apparently larger, and therefore it is hard to change the aggregation structure to accommodate the new solvent-vapor environment. While for the films having the non-equilibrium phase-separation structures, the conformational adjustment under the different solvent vapor will become relatively easier. Owing to this effect, the prepared SIS films with various film-formations kinetics can form different aggregation structures after a specific solvent vapor treatment, and finally leads to dissimilar surface structure.As a result, the surface wettability of these films exhibit different responsiveness to solvent vapor.

关 键 词：苯乙烯/异戊二烯/苯乙烯共聚物 环境响应性 表面结构 和频振动光谱 溶剂蒸气处理 

分 类 号：TB383.2[一般工业技术—材料科学与工程]