A novel antibacterial polysulfone ( PSF) ultrafiltration ( UF) membrane with capsaicin derivatives function structure was prepared. First, copolymer P(H-co-M) through the radical cause was polymerized with N-(4-hydroxyl-3-methoxyl phenmethyl)acrylamide(HMBA) and methyl methacrylate ( MM A) as unconverted monomer. P(H-co-M) was confirmed by the infrared absorption spectrum ( FTIR) and thermo gravimetric analysis. Then, the copolymer P(H-co-M) was introduced to PSF casting solution by the blending method, and the antibacterial UF membrane was prepared through the immersion precipitation phase-inversion method. The effects of copolymer content in the casting solution on the separation performance and antibacterial property of the UF membrane were investigated. When P( H-co-M) content was 0. 5% ( mass fraction) , the modified UF membrane exhibited the best separation performance with flux of 122.2 L/(m · h) and rejection of 84. 4% for a 5 mg/L humic acid solution, which increased by 13. 5% and 9. 2% compared to the PSF UF membrane, respectively. In addition, the antibacterial performance was improved significantly. When P(H-co-M) content was 0. 5% , the antibacterial rate was as high as 58. 8% ; When P( H-co-M) content was 1.0%, the largest antibacterial rate was obtained(80. 7% ). The excellent performance of the modified UF membrane indicates that the novel antibacterial UF membranes with capsaicin derivatives function structure open a new field in the high-efficient membrane materials.%将辣素功能结构单体N-(4-羟基-3-甲氧基苯甲基)丙烯酰胺(HMBA)和甲基丙烯酸甲酯(MMA)通过自由基引发合成出抑菌型共聚物P(H-co-M),通过红外吸收光谱和热重分析证实了共聚物的结构.采用共混法将共聚物引入聚砜(PSF)铸膜液中,通过浸没沉淀相转化法制备了新型抑菌超滤膜.考察了P(H-co-M)含量对超滤膜分离性能及抑菌性能的影响.结果表明,当P(H-co-M)质量分数为0.5％时,超滤膜分离性能最佳,对5 mg/L腐殖酸溶液的稳定水通量为122.2 L/(m2·h),截留率为84.4％,与未添加P(H-co-M)的超滤膜相比,分别提高了19.2％和9.2％.改性超滤膜具有较强的抑菌性能,当P(H-co-M)含量为1.0％时,抑菌率最大(约80.7％).
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