PVA/PVP互穿网络膜的渗透蒸发性质(Ⅱ)

The Pervaporation Properties of the Interpenetrating Network Membrane of Poly(vinyl alcohol) and Poly(vinyl pyrrolidone)(Ⅱ)

用 4 ,4′-双叠氮 -2 ,2′-二磺酸钠 ( DAS)和戊二醛对聚乙烯吡咯烷酮 ( PVP)和聚乙烯醇 ( PVA)依次进行光化学交联和化学交联 ,制备了具有互穿网络结构的渗透蒸发膜 .研究了它们用于醇、酮和醚等有机溶剂脱水的渗透蒸发性质 .结果表明 ,对于大多数有机溶剂 ,随着共混膜中 PVP含量的增加 ,膜的渗透性明显提高 ,而膜的选择性有所下降 .但用于 THF脱水时 ,膜的选择性和渗透性均随着 PVP含量的增加而增加 .

A novel interpenetrating network(IPN) membrane of PVA/PVP crosslinked by chemical crosslinking agent glutaraldehyde and water soluble photocrosslinking agent 4,4′diazostilbene2,2′disulfonic acid disodium salt(DAS) was prepared and the membrane performance in dehydration of some organic solvent by pervaporation as a function of IPN composition was investigated. It was found that the IPN membrane possesses better separation properties compared with noncrosslinking blend. For a majority of organic solvents, the permeation increases with the increasing of PVP content in IPN while the selectivity to water decreases. In case of THF, both the selectivity and the permeation flux of IPN membrane are obviously better than that of PVA membrane, no matter what the PVP content is in IPN membrane. The tension test showed that the mechanical properties of IPN are also remarkably improved.