【摘 要】
：
本文通过化学接枝的方法将一种具有高阳离子密度的亲水性聚合物聚乙烯基胺(PVAm)引入到商品反渗透膜(RE4021-TE反渗透膜,韩国熊津化学公司)表面,制备出PVAm接枝改性反渗透膜,如图1所示.本文所采用的PVAm由实验室自制的聚N-乙烯甲酰胺(PNVF)经部分水解得到.该PVAm聚合物链中含有大量的氨基和酰胺基团.一方面,这些氨基可以与商品反渗透膜表面大量的羧酸基团形成化学键,提供膜表面化学接
【机 构】
：
天津大学化工学院,天津,300350
论文部分内容阅读
本文通过化学接枝的方法将一种具有高阳离子密度的亲水性聚合物聚乙烯基胺(PVAm)引入到商品反渗透膜(RE4021-TE反渗透膜,韩国熊津化学公司)表面,制备出PVAm接枝改性反渗透膜,如图1所示.本文所采用的PVAm由实验室自制的聚N-乙烯甲酰胺(PNVF)经部分水解得到.该PVAm聚合物链中含有大量的氨基和酰胺基团.一方面,这些氨基可以与商品反渗透膜表面大量的羧酸基团形成化学键,提供膜表面化学接枝的“位点”.另一方面,大量带正电、极性很强的伯氨基引入到带负电的商品反渗透膜表面可以明显降低膜表面负电荷密度,并提高膜表面亲水性.作者以蛋白质、多糖、阳离子表面活性剂和胶体等作为污染物,进行抗污染实验.实验结果表明,PVAm接枝改性膜具有较好的抗污染性能.PVAm接枝改性膜的污染后通量下降率不高于BW30FR膜和LFC膜,而清洗后通量恢复率明显高于这两种商品抗污染反渗透膜.
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