电化学诱导表面引发原子转移自由基聚合构筑离子型聚醚砜膜功能表面

采用电化学诱导表面引发原子转移自由基聚合(SI-eATRP)技术,在涂覆聚多巴胺的聚醚砜膜基底上接枝离子型聚合物分子刷聚对苯乙烯磺酸钠,并通过单体浓度对聚合物分子刷进行调控。采用SEM、AFM、XPS、水接触角等表征方法对改性聚醚砜膜的结构和性能进行表征;采用水通量对其进行滤过性能测定。结果表明:成功地在改性聚醚砜膜表面接枝离子型聚合物分子刷聚对苯乙烯磺酸钠;聚合物刷相互缠结形成了球状颗粒;随着电化学诱导体系中单体浓度的增大,聚合物分子刷的接枝量增加,同时水接触角显著降低;聚合物膜表面离子型分子刷的构筑改善了亲水性,因此其纯水通量明显增加,牛血清白蛋白(BSA)截留率和通量恢复率都得到了提高。SI-eATRP用于聚合物膜材料的表面改性和调控,在生物相容性膜等领域具有潜在的应用前景。

Construction of Ion-type Functional Surface of Polyethersulfone Membrane via Surface-initiated Electrochemical-mediated Atom Transfer Radical Polymerization(SI-eATRP)

The polymer brushes of poly(sodium p-styrenesulfonate hydrate) was introduced onto polyethersulfone membrane by coating poly(dopamine) and grafting poly(sodium p-styrenesulfonate hydrate) via surface-initiated electrochemical-mediated atom transfer radical polymerization(SI-eATRP), and the monomer concentration was used to adjust the amount of polymer brush. The structure and properties of the modified membrane were characterized by SEM, AFM, XPS, and water contact angle, and the filtration performance was measured by water flux. The results showed that poly(sodium p-styrenesulfonate hydrate) chains were successfully grafted onto the membrane surface, and polymer brushes were tangled to form spherical particles. With the increase of monomer concentration in the electrochemical induced system, the amount of grafting polymer brush increased, thus the water contact angle decreased significantly. The hydrophilicity of the ionic membrane improved, which contributed to the obvious increase of water flux. The BSA rejection rate and flux recovery rate performance have been improved. SI-eATRP method used for surface modification and regulation of polymer film materials has potential application prospects in biocompatible membranes.