PTFE对PDMS复合膜在低浓度有机物水溶液中渗透汽化性能的影响

制备了聚四氟乙烯（PTFE）超细粉体填充聚二甲基硅氧烷（PDMS）复合膜，通过扫描电子显微镜、傅里叶变换红外光谱仪、热失重分析仪等测试仪器对复合膜进行了表征，利用低浓度有机物（乙醇、丙酮、正丙醇）水溶液体系进行渗透汽化，并由单组分溶解实验计算了有机物（乙醇、丙酮、正丙醇）在复合膜中的溶解度。结果表明，PTFE含量由0增加至10 %（质量分数，下同）时， 复合膜的表面积及热稳定性得到了提高，有机物乙醇、丙酮、正丙醇在复合膜中的溶解度分别由0.0923、0.1589和0.2691 g/g提高至0.0991、0.1678和0.2773 g/g；加入PTFE后提高了复合膜的渗透汽化性能。

Effect of PTFE on Pervaporation of PDMS Composite Membrane in Dilute Organic Solution

A novel composite membrane of micron PTFE powder filled PDMS was prepared for the pervaporation of organic components (ethanol, 1 propanol and acetone) from water. The physical structure of this kind of composite membrane was investigated by SEM, FTIR and TG. The solubility for organic components (ethanol, 1 propanol and acetone) in the composite membrane was achieved. The results showed that the addition of PTFE from 0 to 10 % in PDMS membrane increased the surface area and thermal stability of PDMS membrane as well as the solubility of above organic components from 0.0923 to 0.0991 g/g, from 0.1589 to 0.1678 g/g and from 0.2691 to 0.2773 g/g respectively, and also the pervaporation of this PDMS membrane.