PVDF膜材料表面形态与防污性关系研究

Research on relationship of the PVDF membrane surface and antifouling

以PVDF为涂层胶,采用不同粗糙度的模板进行涂层制膜,通过接触角测试仪和SEM扫描电镜进行表征,研究了静态接触角与表面粗糙结构的关系;通过预涂疏水剂和混合疏水剂研究具有粗糙表面的PVDF膜静态接触角、滚动角与表面能的关系.结果表明,接触角随表面凸起直径和表面能的变小而增大,而滚动角随表面能的变小而变小,与表面粗糙结构无关.实验测得预涂了含氟疏水试剂且表面凸起直径为8.5μm的模板经涂层后,所获得的PVDF膜接触角为172°、滚动角为2°,实现了PVDF膜材料的防污自洁.

Homemade templates of different micro scale were used to prepare super-hydrophobic PVDF, and the effects of different micro-nano rough structure on super-hydrophobicity were analyzed. Low-surface-energy polymers were applied on the film through surface smearing and blend doping, and the relation between surface free energy and hydrophobicity was investigated. The result showed the static contact angle was related to the influence of both surface free energy and rough structure, and the static contact angle in- creased with the reducing of surface free energy. The rolling angle of film depended on the surface free energy. The lower the surface energy was, the smaller the rolling angle was. The effect of surface roughness on the rolling angle was not obvious. Based on the re- search, the film of PVDF with excellent character of anti-contamination and self-cleaning could be got when it was made by the homemade templates whose rough structure was 8.5 μm, modified by the fluoropolymer through surface smearing , The static contact angle was 172°, and the rolling angle was 2°. The PVDF membrane material antifouling self-cleaning was realized.