Research Progress on Preparation and Modification of Polyvinylidene Fluoride Membrane

Immersion precipitation is one of the commonly used methods in preparing polyvinylidene fluoride membrane (PVDF) membrane. Using this method, the membrane structure is easily controlled and the operation is very simple. This paper summarized the mechanism and preparation methods of PVDF as well as researching the effects of membrane-forming factors such as ingredient of solvents and non-solvents, temperature and additives etc. on the structure and function of PVDF membrane. Applying modification on PVDF membrane can improve its hydrophilicity and anti-fouling properties, of which blending modification is expected to be a hotspot of study in future. Adding catalytic agent into PVDF can generate catalytic membrane, which offers a researching direction for preparing multi-functional PVDF membrane. Finally, brief comments are made on the improvement of membrane pore structure and problem of singleness of blending materials.