聚丙烯微孔膜的表面改性和抗污染性

Surface Modification and Anti-Fouling of Polypropylene Porous Membrane

用化学方法在聚丙烯微孔膜表面上接枝丙烯酰胺。利用红外光谱,X射线光电子能谱,扫描电镜,原子力显微镜观察了膜表面形态和微观结构的变化,同时考察了膜的接触角和吸水能力,对BSA蛋白质的吸附量及水通量和抗污染能力。结果表明,随着接枝率的提高,接触角从95°减小到38°,吸水率也提高到163.9%。改性后,PP膜对BSA的吸附减少,膜的水通量减小,但同时膜的污染率下降,当接枝率为11.5%时,膜的污染率为0.274,比接枝前下降了55%。改性后PP微孔膜的亲水性和抗污染能力得到较大提高。

Surface modification of polypropylene microporous membrane was performed by grafting polymerization of acrylamide. The morphological and microstructure changes of the membrane surface were confirmed by ATR-FT-IR, XPS, SEM and AFM. The contact angle, uptake water ability, protein adsorbed amount, water flux and antifouling property were studied as well. The results indicate that the contact angle on the grafted membrane decreases from 95° to 38° and the uptake water ratio is up to 163.9% with the increase of grafting degree. The amount of protein adsorbed on the modified membrane is smaller than the unmodified membrane, The fouling ratio of the membrane falls down though the water flux reduces, the fouling ratio of the grafted membrane with the grafting degree 11.5% is 0.274. The hydrophilic and antifouling property of the grafted membrane are improved.