Tran Thien N, Ramanan Sankara N, Lin Haiqing
Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York at Buffalo.
Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York at Buffalo;
J Vis Exp. 2017 Apr 7(122):55426. doi: 10.3791/55426.
Hydrogels have been widely utilized to enhance the surface hydrophilicity of membranes for water purification, increasing the antifouling properties and thus achieving stable water permeability through membranes over time. Here, we report a facile method to prepare hydrogels based on zwitterions for membrane applications. Freestanding films can be prepared from sulfobetaine methacrylate (SBMA) with a crosslinker of poly(ethylene glycol) diacrylate (PEGDA) via photopolymerization. The hydrogels can also be prepared by impregnation into hydrophobic porous supports to enhance the mechanical strength. These films can be characterized by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) to determine the degree of conversion of the (meth)acrylate groups, using goniometers for hydrophilicity and differential scanning calorimetry (DSC) for polymer chain dynamics. We also report protocols to determine the water permeability in dead-end filtration systems and the effect of foulants (bovine serum albumin, BSA) on membrane performance.
水凝胶已被广泛用于提高用于水净化的膜的表面亲水性，增强抗污染性能，从而随着时间的推移实现通过膜的稳定水渗透性。在此，我们报告一种基于两性离子制备用于膜应用的水凝胶的简便方法。可以通过光聚合由甲基丙烯酰基磺酸甜菜碱（SBMA）与聚乙二醇二丙烯酸酯（PEGDA）交联剂制备独立的膜。水凝胶也可以通过浸渍到疏水性多孔载体中来制备，以提高机械强度。这些膜可以通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）表征，以确定（甲基）丙烯酸酯基团的转化率，使用测角仪测定亲水性，使用差示扫描量热法（DSC）研究聚合物链动力学。我们还报告了在死端过滤系统中测定水渗透性以及污垢物质（牛血清白蛋白，BSA）对膜性能影响的方案。
