渗透汽化分离DMF/水混合物的PVA-g-AAm膜的制备和表征  

Preparation and Characterization of PVA-g-AAm Membrane for Vaporization Separation of DMF/Water Mixture

作　　者：李春玲[1] 海士坤[1] 

机构地区：[1]商丘医学高等专科学校,河南商丘476100

出　　处：《当代化工》2016年第2期250-252,共3页Contemporary Chemical Industry

摘　　要：使用聚乙烯醇及丙烯酰胺这两种材料,合成了不同枝度的共聚物(PVA-g-AAm),并对两种渗透汽化复合膜(PVA-g-AAm)进行制备。黏均分子量是运用用黏度法测定的,而表征则分别由接触角,红外光谱(FT-IR)和热重(TGA)等方法进行测定。而DMF/水混合体系的渗透汽化分离主要是复合膜的运用,并对膜分离的影响因素进行分析。实验结果显示,分离性能最好的是接枝度为90%的PVA。而PVA的渗透量随着DMF质量分数的增加而减少,PVA的通量最小时是在0.25~0.65 kg/(m^2·h)之间,在0.2~而膜的分离因子达到最大时DMF质量分数为33%。而温度的增加可是渗透量增大,分离因子减小。Polyvinyl alcohol（PVA） and acrylamide（AAm） were used as raw materials to synthesize the copolymer（PVA-g-AAm） with different branch degree, and two pervaporation composite films（PVA-g-AAm） were prepared. Viscosity-average molecular weight was determined by the viscosity method, and they were characterized by determining contact angles, infrared spectroscopy（FT-IR） and thermogravimetric（TGA） methods. The vaporization separation of DMF/water mixture was carried out by the composite membrane, and the factors to affect membrane separation were analyzed. Experimental results show that the separation performance of PVA with grafting degree of 90% is the best. The permeation amount of PVA reduces as DMF content increases, PVA minimum flux is 0.25 ~ 0.65 kg /（m^2·h）. Increasing the temperature can increase the amount of penetration, separation factor reduces.

关 键 词：PVA-g-AAm复合膜 渗透汽化 DMF/H2O混合物 制备 表征 

分 类 号：TQ028[化学工程]