含氟丙烯酸酯共聚物制备超疏水表面及其形成机理的研究

以丙烯酸全氟烷基乙基酯和甲基丙烯酸甲酯为共聚单体, 分别以用微乳液聚合法和溶液聚合法制备的无规共聚物和用可逆加成-断裂链转移制备的嵌段共聚物作为成膜共聚物, 并以1,1,2-三氟三氯乙烷作为溶剂, 采用溶剂挥发成膜法可以直接制备出超疏水膜, 聚合物膜对水的接触角可达160°. 改变聚合物结构和成膜条件, 探讨了该类超疏水膜的形成机理和影响因素. 发现膜的表面形貌和疏水性与共聚物的组成、结构、分子量以及成膜条件密切相关, 随着共聚物中氟含量的增大, 膜的表面形貌都趋于平滑; 而且, 无规共聚物比嵌段共聚物更易形成粗糙度好的膜; 同时, 较大的聚合物分子量和适宜的高的成膜温度都对形成粗糙结构有利.

Study on Preparation and Forming Mechanism of Super-hydrophobic Surface by Perfluoroalkyl Ethyl Acrylate Copolymers

The super-hydrophobic copolymer films of perfluoroalkyl ethyl acrylate (FAEA) and methyl methacrylate (MMA) were prepared by evaporating solvent of 1,1,2-trifluoro-trichloro-ethane (F113). The surface morphologies and hydrophobicity of as-prepared films were greatly determined by the copolymer structure and the molecular weight as well as the casting conditions. As increasing the proportion of FAEA in the copolymer, the films surface became smoother. The random copolymers were inclined to form rougher surfaces than the block copolymers. Moreover, the copolymers with higher molecular weight or as cast at higher temperature will benefit to achieve films with harsh surfaces. Forming mechanism as well as affecting factors of the super-hydrophobic films was also proposed and discussed in this paper.The super-hydrophobic copolymer films of perfluoroalkyl ethyl acrylate (FAEA) and methyl methacrylate (MMA) were prepared by evaporating solvent of 1,1,2-trifluoro-trichloro-ethane (F113). The surface morphologies and hydrophobicity of as-prepared films were greatly determined by the copolymer structure and the molecular weight as well as the casting conditions. As increasing the proportion of FAEA in the copolymer, the films surface became smoother. The random copolymers were inclined to form rougher surfaces than the block copolymers. Moreover, the copolymers with higher molecular weight or as cast at higher temperature will benefit to achieve films with harsh surfaces. Forming mechanism as well as affecting factors of the super-hydrophobic films was also proposed and discussed in this paper.