聚丙烯腈超滤基膜的水解改性  

Hydrolysis modification of polyacrylonitrile ultrafiltration membranes

作　　者：闫海红[1] 张国俊[1] 纪树兰[1] 谷维粱[1] 刘忠洲[2] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100022 [2]中国科学院生态环境研究中心,北京100085

出　　处：《膜科学与技术》2007年第5期56-61,共6页Membrane Science and Technology

基　　金：国家基础研究发展计划(973计划)项目(2003CB615701);北京市教委专款项目(科技成果转化与产业化建设-科技园孵化转化项目05005999200601);北京市科技新星计划(B类)(2006B13)

摘　　要：通过在不同水解程度的PAN基膜上组装聚电解质复合物膜，发现PAN基膜水解程度对聚电解质复合物膜的渗透汽化性能有重要影响．基于此，对PAN超滤基膜的碱性水解条件进行了筛选．通过对不同水解条件下改性前后基膜通量、截留率的测定，确定较为适宜的水解条件：NaOH浓度2mol／L，水解温度60～70℃，水解时间1h．润湿角和红外光谱检测证实，改性后基膜表面亲水性和荷电性增强利于后续的聚电解质复合物膜组装．此外，采用不同的碱性水解剂对PAN超滤进行水解，发现碱性越强的水解剂，PAN基膜水解程度越高．实验结果对改进PAN超滤膜亲水性，改变超滤膜的截留率和对荷负电溶质的耐污染性有所参考．By assembling polyelectrolyte composite membranes on polyacrylonitrile （PAN） support membranes with different hydrolyzed degree, it was found that hydrolyzed degree of PAN had significant effects on pervaporation performances. Therefore, the alkaline hydrolysis experiment was carried out to select the suitable conditions. By comparing the membrane flux and retention ratio under different hydrolysis conditions, the suitable hydrolysis conditions were determined as follows： NaOH concentration 2 mol/L, hydrolysis temperature 60 ℃ and hydrolysis time lh. The experimental results of contact angle and IR proved that the hydrophilicity and charging property of hydrolyzed membrane were improved. This would benefit the subsequent assembly of polyelectrolyte composite membranes. In addition, it was noted from the experiments with different hydrolysis agents that alkaline solution with high intensity is beneficial to improve hydrolyzed degree.

关 键 词：聚丙烯腈超滤膜 LBL技术 氢氧化钠 渗透汽化膜 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]