聚氨酯-全氟烷基丙烯酸酯复合乳胶膜性能研究

Properties of films of polyurethane-perfluorinated acrylate hybrid emulsion

制备稳定的全氟烷基丙烯酸酯改性阳离子聚氨酯复合乳液,并通过红外和核磁共振氢谱对其结构进行表征。重点研究功能性单体全氟烷基丙烯酸酯(FA)用量及阳离子扩链剂N-甲基二乙醇胺(MDEA)用量对复合乳胶膜性能的影响。力学性能分析表明,FA用量对乳胶膜拉伸强度影响比较复杂;随MDEA用量增大,乳胶膜拉伸强度增大。表面自由能分析表明随FA、MDEA用量增大,乳胶膜表面自由能降低。乳胶膜表面扫描电镜表明含氟乳胶膜表面光滑洁净,表面EDS能谱分析表明,随着FA及MDEA用量增大,氟原子更容易向膜表面迁移;乳胶膜断面扫描电镜表明随着FA及MDEA用量增大,乳胶膜断面呈规整的分层结构。

The perfluorinated acrylate modified cationic polyurethane （PUFA）hybrid emulsions were prepared and characterized by IR and 1 H NMR.The emphasis was put on the influence of the content of FA as functional monomer and the content of MDEA as cationic extender on the PUFA hybrid films properties.The mechanical property test results showed that the FA content had complex effects on the tensile strength of the PUFA films and the tensile strength of the PUFA films increased with the increasing MDEA content.The analysis indicated that the surface free energy of PUFA films decreased with the increase of the FA and MDEA content.SEM im-age showed that the surface of the PUFA films was smooth and clean.The EDS spectrum of PUFA films sur-face showed that the fluorine atoms were more likely to migrate to the film surface with the increase of the FA and MDEA content.SEM photos indicated that the PUFA films section had more regular layered structure with the increase of the FA and MDEA content.