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为了赋予微孔聚丙烯膜(MPPM)抗菌能力,发展了一种有效的表面季铵化方法。基于紫外光引发丙烯酸的接枝聚合,通过碳二亚胺活化,将聚亚乙基亚胺(PEI)共价固定于MPPM表面,用环氧丙烷对PEI链上的伯胺和仲胺进行叔胺化,最后再和苄氯反应,成功地使MPPM表面季铵化。采用FTIR、XPS、荧光素二钠盐染色和水接触角对膜进行了表征。采用平板活菌计数法考察了季铵化膜对大肠杆菌和金黄色葡萄球菌的抗菌性能。结果显示,季铵化膜对大肠杆菌和金黄色葡萄球菌均具有强的抗菌活性;增加膜表面阳离子密度或延长接触时间,均能有效提高膜的抗菌能力。
In order to give the microporous polypropylene membrane (MPPM) antibacterial capacity, an effective method of surface quaternization has been developed. Based on the UV-initiated graft polymerization of acrylic acid, polyethyleneimine (PEI) was covalently immobilized on the surface of MPPM via carbodiimide activation. The primary and secondary amines on the PEI chain were oxidized with propylene oxide Amination, and finally with benzyl chloride, successfully MPPS surface quaternized. The membranes were characterized by FTIR, XPS, fluorescein disodium salt staining and water contact angle. The antibacterial activity of quaternary ammonium membrane against Escherichia coli and Staphylococcus aureus was investigated by viable cell count method. The results showed that the quaternary ammonium membrane of Escherichia coli and Staphylococcus aureus have strong antibacterial activity; increase the membrane surface cationic density or prolonged exposure time, can effectively improve the antimicrobial capacity of the membrane.