基于响应面分析法的PVDF膜紫外接枝亲水改性的研究

摘要

Poly(vinylidene fluoride) (PVDF) membranes were prepared by non-solvent induced phase separation, and then hydrophilic monomers like acrylic acid (AA) and 2-hydroxyethylmethacrylate (HEMA) were grafted onto the surface of PVDF membranes via UV grafting with benzophenone as photo-initiator. The experiment of UV grafting was designed by response surface methodology, and the effects of the monomer con-centration and irradiation time on the hydrophilic modification of PVDF membranes were studied, respectively. The optimization of process solution for the two graft monomers was achieved. The optimal solution for the AA grafted PVDF (PVDF-g-AA) membranes was the AA mass concentration of 1.98%, the irradiation time of 40 minutes, and the water absorption ratio of the membrane so obtained was 109.95%; while for the HEMA grafted PVDF (PVDF-g-HEMA) membranes, the HEMA mass concentration was 1.5%, the irradiation time was 36.64 minutes, and the water absorption ratio of the membrane obtained was 96.95%.%采用非溶剂致相分离法制备了聚偏氟乙烯（PVDF）分离膜；以二苯甲酮为光引发剂，通过紫外接枝将亲水性单体丙烯酸（AA）和甲基丙烯酸-2-羟基乙酯（HEMA）接枝在PVDF膜表面。应用响应面分析法设计了紫外接枝实验，分别考察了单体浓度和紫外辐照时间对两种PVDF膜亲水改性效果的影响，优选出最佳工艺方案。AA接枝PVDF膜的最优方案：w（AA）为1.98%，辐照时间为40min，此时接枝膜的吸水率为109.95%。HEMA接枝PVDF膜的最优方案：w（HEMA）为1.5%，辐照时间为36.64min，接枝膜的吸水率为96.95%。