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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。
Poly (acrylonitrile) (PAN) ultrafiltration membrane modified with NaOH solution was used as the basement membrane, and it was prepared by the interfacial polymerization reaction on the monomers of ’- diaminodiphenylmethane (DDM) and trimesoyl chloride (TMC) Composite nanofiltration membrane. The effects of amine concentration, acid acceptor concentration and interfacial polymerization time on membrane separation performance were investigated. The surface morphology and cross-sectional structure of the composite membrane were investigated by FTIR and ESEM. The relationship between the structure and properties of the composite nanofiltration membrane was discussed. The results showed that a dense skin layer was formed on the PAN modified membrane by interfacial polymerization. The dense skin layer was polyamide.