新型聚阴离子电解质膜材料羧甲基化PVA的合成表征及性能  

The synthesis and characterization and performanceof a novel polyantion electrolyte membranematerlal carboxymethylated PVA

作　　者：孟平蕊[1] 李良波[1] 荣凤玲[1] 秦怀侠[1] 刘雪春[2] 陈翠仙[2] 

机构地区：[1]济南大学化学与化工学院,山东济南250022 [2]清华大学化工系,北京100084

出　　处：《功能材料》2006年第10期1566-1568,共3页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2003CB615701)

摘　　要：聚乙烯醇(PVA)与氯乙酸在KOH的催化下,合成了一种新型聚阴离子电解质羧甲基化PVA(CMPVA)。考察了反应时间、温度、氯乙酸用量对取代度(DS)的影响,用傅立叶变换红外光谱(FT-IR)、扫描电镜(SEM)对CMPVA的化学结构和膜表面形态进行了表征,CMPVA的导电性、耐热性随DS的增大而提高,分别将PVA、CMPVA及CMPVA/季铵化聚阳离子PVA(QAPVA)复合物制备渗透汽化复合膜,用于乙醇/水体系进行渗透汽化分离。其中CMPVA/QAPVA复合物膜对水的分离因子α为1440、渗透通量J为850g/m2.h。A novel polyanion electrolyte earboxymethylated polyvinyl alcohol （CMPVA）was synthesized by earboxymethylated polyvinyl aleohol（PVA） with monoehloroaeetie acid and KOH as catalyst. The factors affecting the reaction were investigated. CMPVA exhibited higher glass transition temperature. The conductivity of CMPVA aqueous solution showed the direct proportion relationship with CMPVA concentration. Further prepared PVA and CMPVA into the dense membranes and observed the membrane surface morphology. It is found that the surface of PVA membrane was flat,whereas the surface of CMPVA membrane took on many snow shape. The chemical structure of CMPVA also was studied by FT-IR. PV membranes were prepared from CMPVA applied in the separation of water/ethanol system （containing 95.4wt% ethanol） at 75℃. They showed the permeation flux of 400g/m^2·h and the separation factor of 640. Further, the composite membranes were made from CMPVA/ QAPVA. The permeation flux of 1440g/m^2·h and separation factor of 850 for water/ethanol system （containing 90wt% ethanol）.

关 键 词：聚阴离子电解质 羧甲基化聚乙烯醇 渗透汽化膜 

分 类 号：TQ028[化学工程]