摘要
把LiCl当作添加剂加入到聚乙烯醇(PVA)铸膜液中,以聚醚砜膜(PES)作为支撑层,制备PVA/PES复合膜.测试了复合膜的透湿性能.结果表明:由X射线衍射图得LiCl的加入降低了PVA膜的结晶度.PVA/PES复合膜与水的接触角随着LiCl含量的增加而逐渐减少,即随着LiCl含量的增加,复合膜的亲水性增强,这是由于LiCl具有强吸湿性.在保持铸膜液中PVA含量为8%,交联剂(苹果酸)、催化剂(乙酸)浓度不变的情况下,改变LiCl的含量,膜的水蒸气总传质系数、渗透速率和湿交换效率随着LiCl含量的增加呈上升趋势,数据趋势与X射线衍射图、接触角等现象相符合.添加LiCl所制的复合膜不仅不能透过CO2,而且还具有良好的水蒸气渗透性能.
The composite membranes with polyvinylalcohol （PVA） as separating layer material and polyethersullone （PES） as supporting layer material were prepared. The LiCl was used as the additive. The vapour permeability of membranes was tested. X - ray diffraction patterns revealed that the crystallinity of the membrane was decreased when the LiCl additive was added into the solution. The contact angle decreased with the increase of LiCl. In other words, the more LiCl, the stronger hydrophilicity. The total vapor transfer coefficient, the vapor permeation rate, and the moisture transfer efficiency of the membranes increase with the content of the LiCl increasing, when the mass fraction of PVA was kept to be 8 %. The experimental results indicated that the membranes with LiCl had better vapor penetrability while CO2 couldn＇t permeate.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2008年第6期18-22,共5页
Membrane Science and Technology
关键词
聚乙烯醇
非对称膜
碱金属
复合膜
poly（vinylalcohol）
asymmetric membrane
alkali metal
composite membrane
