Effect of TEOS additive on the morphology and performance of PVDF film.

A series of polyvinylidene fluoride membranes (PVDF) and TEOS modified PVDF membranes are prepared using N,N-dimethylacetamide (DMAc) as the solvent and the immersion preripitation phase inversion method (NIPS). The morphology of the film is observed with a scanning electron microscope, and the influence of the concentration of the casing solution and the TEOS additive on the properties of the film material is investigated through the contact angle, porosity, water permeability and other performance characteristics. The results show that compared with pure membranes, the addition of ethyl orthoriticate can improve the overall performance of hybrid membranes. The concentration of the casing solution is 17%, and the PVDF hybrid membrane prepared by adding 1% TEOS has a contact angle of 86.06°, a porosity of 42.86%, and a water permeability of 2.080 L/(m² • h). At this time, the synthesis of the hybrid membrane achieves the best performance. [ABSTRACT FROM AUTHOR]