Research on relationship of the PVDF membrane surface and antifouling

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 increased 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 research,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.