Abstract:

Surface grafting bactericidal materials are commonly used methods to improve the antibacterial and anti-pollution properties of membranes. Guanidine compounds have received a lot of attentions due to their efficient and broad-spectrum antibacterial properties, easy preparation and low toxicity to the mammalian cell. Herein, a guanidine based polymer, namely PEIGH, was prepared through melt phase polycondensation of polyethyleneimine and guanidine hydrochloride, then used for ultrafiltration membrane surface modification with the assist of polydopamine. The results show that the synthesized PEIGH possesses good antibacterial property. Compared to the unmodified membranes, the membranes modified by PEIGH have better wettability. The permeation flux increases by 11%-98% and rejection for bovine serum albumin raises from 96.6% to 98.3% above. Antibacterial, anti-organic and anti-biobial properties have been significantly improved.

Key words: membranes, ultrafiltration, PEIGH, surface modification, selectivity, antibiofouling

摘要：

表面接枝杀菌材料是提高膜抗菌和抗污染性能的常用手段。胍基化合物具有杀菌广谱、易制备、低毒等优点，已受到研究者的广泛关注。通过聚乙烯亚胺和盐酸胍的熔融聚合反应制备胍基聚合物（聚乙烯亚胺胍盐酸盐，PEIGH），并利用聚多巴胺中间层将其接枝到聚砜超滤膜表面。结果表明，PEIGH具有良好的抗菌性能，经其改性后的超滤膜润湿性能提高，纯水通量提高了11%~98%，牛血清蛋白截留率由96.6%提高到98.3%以上。抗菌性能、抗有机物污染和抗生物污染性能均得到明显改善。

关键词: 膜, 超滤, 聚乙烯亚胺胍盐酸盐, 表面改性, 选择性, 抗生物污染