以PAN为基膜的复合纳滤膜的制备研究

Study on preparation of composite nanofiltration membrane based on PAN substrate

以NaOH溶液改性后的聚丙烯腈(PAN)超滤膜为基膜,对,对′-二氨基二苯甲烷(DDM)和均苯三甲酰氯(TMC)为单体,经过界面聚合反应制备复合纳滤膜。考察了胺浓度、酸接受剂浓度、界面聚合时间等对膜分离性能的影响。结合FTIR和环境扫描电镜(ESEM)研究复合膜的表面形态及断面结构,讨论了复合纳滤膜致密层的结构与其性能的关系。结果表明,采用界面聚合反应在PAN改性膜上已复合一层致密的表皮层,该致密表皮层是聚酰胺结构。

Composite nanofiltration（NF） membranes were prepared by the interracial polymerization of p,p＇-diamino-diphenyl methane（DDM） with trimesoyl chloride（TMC） on the surfaces of microporous PAN supports, which were modified by using sodium hydroxide（NaOH）. In this paper,The effects of concentrations of amine, acid acceptant and polymerizing time on the separating performance were investigated. The surface morphological and cross section structures of composite membrane were observed by using FTIR and ESEM. And the relationship between the structure and the performance of composite nanofiltration membrane was discussed. The results showed that a dense skin layer, which is a kind of polyamide structure, had been combined with the modified PAN substrate surface due to the interracial polymerization.