带有羧基的含氟丙烯酸酯共聚物的制备及超疏水性能研究

Study on the Synthesis and Superhydrophobic Properties of Fluorinated Copolymers with Carboxyl Group

以甲基丙烯酸、甲基丙烯酸甲酯、甲基丙烯酸全氟烷基乙基酯为单体,以可逆加成-断裂链转移方法合成含氟嵌段共聚物,同时以常规自由基溶液聚合制备相似组成的无规共聚物.采用溶剂挥发成膜方法成膜,研究共聚物组成与结构对膜表面形貌和疏水性能的影响.结果表明,羧基单体的引入改变了含氟丙烯酸酯聚合物的溶解性能和成膜性能,使用常用溶剂就可获得超疏水性膜.当甲基丙烯酸甲酯、甲基丙烯酸物质的量的比在5∶1～1∶1时,聚合物疏水性能最优;研究甲苯、四氢呋喃、三氟甲苯三种不同溶剂对膜表面结构和疏水性质的影响,其中甲苯所成膜的疏水性能最优,其疏水角高达157°.嵌段共聚物因为链段规整,疏水性较无规共聚物更好.

The copolymers were synthetized by reversible addition-fragmentation chain transfer（RAFT） and free radical polymerization in cyclohexanone with monomers methyl methacrylate（MMA）,methacrylic acid（MAA） and perfluoroalkyl ethyl methylacrylate（FMA）.The surfaces were generated by one-step cast-ing process with different solvents.The surface morphologies and hydrophobicity of as-prepared films were determined by copolymer structure and composition.The carboxyl group could change the solubility of fluorinated copolymers and their surface morphologies,which could help to get superhydrophobic surface by conventional solvent.The hydrophobic property was good when the MMA/MAA molar proportion was from 5∶1 to 1∶1.Different hydrophobic surfaces were generated by different solvents such as toluene,tetrahydrofuran and benzotrifluoride.And the contact angle of surfaces generated by toluene was 157°.The block copolymers could make better superhydrophobicity than the random copolymers due to the more or-dered structure.