摘要：采用化学接枝方法对PP微孔膜表面进行亲水改性，通过在膜上引入含亲水基团的单体使膜表面的接触角下降，亲水性提高，从而提高它的抗污染性。本实验采用重铬酸钾，水，浓硫酸（配比为1∶2∶20）混合溶液预处理PP膜，使膜表面产生接枝点，再用合适的引发剂，在一定条件下接枝合适的单体。在控制其他因素的情况下，考察单体浓度，引发剂浓度，反应温度，反应时间对膜接枝率的影响。并对PP基膜和接枝后的膜进行红外光谱，水接触角等测试，比较并分析接枝前后PP膜的变化情况。通过研究可以得出结论：丙烯酰胺，丙烯酸，甲基丙烯酸甲酯能成功地接枝到PP膜上；单体浓度，引发剂浓度，温度，时间等和膜的接枝率都有一定的对应关系；接枝后的PP膜和PP基膜相比水接触角有明显的下降，亲水性得到提高。

关键词：PP微孔膜；亲水改性；丙烯酰胺；接枝率；水接触角

Abstract：Study the hydrophilic modification of the polypropylene micro-porous membrane by chemical grafting method to make the contact angle of the membrane smaller and the hydrophily better by grafting monomers with hydrophilic groups and to promote the anti-biofouling properties. In this study, potassium dichromate, water concentrated sulfuric acid mixed solution (ratio 1:2:20) pretreatment PP film to produce grafted points on the surface, and use suitable initiator to graft suitable monomer onto the surface of the membrane under certain conditions. Control the other conditions, inspect the influences of monomer concentration, initiator concentration, reaction temperature and reaction time on the membrane grafting degree. After grafting, test the infrared spectroscopy, water contact angles of the membrane, comparing all the results with those of the original membrane. We can draw a conclusion through the research: the acryl amide, acrylic acid, methyl methacylate can be grafted onto the surface of the membrane successfully; There are some relationships between the monomer concentration, the initiator concentration, the reaction temperature, the reaction time and the grafting degree; That grafted polypropylene membrane compared with the original polypropylene membrane, the water contact angle is much smaller, and the hydrophilic is improved.

Key words: Polypropylene microporous membrane; Hydrophilic modification; Acrylamide Grafting degree; Water contact angle