交联剂对PVDF-g-PACMO共聚物膜抗污染性的影响

为了增强聚偏氟乙烯接枝丙烯酰吗啉(PVDF-g-PACMO)共聚物膜的抗蛋白质吸附性能,在共聚物合成时加入交联剂乙二醇二甲基丙烯酸酯(EGDMA)。采用液-液相分离方法制备一系列EGDMA含量不同的共聚物膜,并研究交联剂的含量对共聚物膜抗蛋白质吸附性能的影响。FT-IR测试表明含有EGDMA的共聚物已成功合成。XPS、SEM、接触角、静态蛋白吸附以及渗透实验表明随着共聚物膜中交联剂EGDMA含量的增加,PACMO更容易向膜表面偏析,膜孔数量增多,亲水性提高,静态蛋白吸附量下降,纯水通量提高,总污染指数下降,可逆污染指数提高,不可逆污染指数下降。结果表明交联剂EGDMA可以显著增强PVDF-g-PACMO共聚物膜的抗蛋白质吸附性能。

Effect of Cross-linking on Antifouling Properties for PVDF-g-PACMO Membranes

In order to enhance the capability of resistant to protein adsorption of the copolymer membrane of polyacryloylmorpholine-graft-acryloylmorpholine(PVDF-g-PACMO), a crosslinking agent of ethylene glycoldimethacrylate(EGDMA) was added to prepare the copolymer.The copolymers with different proportions of the crosslinking agent were cast into flat membranes via a liquid-liquid phase separation technique, and then the influence of EGDMA contained in the membranes on its capability of resistant to protein adsorption was investigated.FT-IR results indicate the PVDF-g-PACMO copolymers with EGDMA are synthesized successfully.A series of tests, including XPS, SEM, the contact angle, the static protein adsorption and permeation experiments, show that PACMO is much easier to segregate to the surface with the increase of the crosslinking agent content in the system, the number of membrane pores increases, meantime, the hydrophilicity and water flux of the copolymer membranes are improved.Moreover, the adsorption amount of protein, total pollution index and irreversible pollution index decrease, and reversible pollution index increases.All results indicate the crosslinking agent of EGDMA can enhance the capability of resistant to protein adsorption of PVDF-g-PACMO membranes.