TEOS添加剂对PVDF膜形貌及性能影响

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

以N,N-二甲基乙酰胺(DMAc)为溶剂,采用浸没沉淀相转化法(NIPS)制备了一系列聚偏氟乙烯(PVDF)膜以及正硅酸乙酯(TEOS)改性聚偏氟乙烯(PVDF)杂化膜材料。用扫描电子显微镜观察膜的形貌,并通过接触角、孔隙率、透水率等性能表征,考察了铸膜液浓度及TEOS添加剂对膜材料性能的影响。结果表明,与纯膜相比,加入正硅酸乙酯可以使杂化膜的综合性能提高。铸膜液浓度为17%,添加1%TEOS所制备的PVDF杂化膜,接触角为86.06°,孔隙率42.86%,透水率达到2.080 L/(m^(2)·h),此时杂化膜的综合性能最佳。

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 precipitation phase inversion method(NIPS).The morphology of the film is observed with a scanning electron microscope,and the influence of the concentration of the casting 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 orthosilicate can improve the overall performance of hybrid membranes.The concentration of the casting 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/(m^(2)·h).At this time,the synthesis of the hybrid membrane achieves the best performance.