吡啶取代度对聚乙烯醇基碱性阴离子交换膜性能的影响  

Effect of Pyridine Substitution Degree on Properties of Poly(vinyl alcohol) Based Anion Exchange Membranes

作　　者：王丹[1] 王一夫[1] 王吉林[1] 王璐璐[1] 陈文艺[1] Dan Wang;Yifu Wang;Jilin Wang;Lulu Wang;Wenyi Chen(School of Chemical Engineering and Environmental Engineering,Liaoning Shihua University,Fushun 113000,China)

机构地区：[1]辽宁石油化工大学化学化工与环境学部

出　　处：《高分子材料科学与工程》2019年第12期69-75,共7页Polymer Materials Science & Engineering

基　　金：辽宁省科技厅博士启动项目(20141126);辽宁省教育厅科学研究一般项目(L2013153);辽宁石油化工大学博士启动基金(2013XJJ-006)

摘　　要：将具有共轭结构的吡啶盐接枝在聚乙烯醇(PVA)基质上,制备出吡啶基团功能化的PVA-FP阴离子交换膜。N元素分析测得该系列膜最大取代度为10.4%(No.3膜);吡啶基团的引入将膜的初始热降解温度提高了近32℃;吡啶基团的线性分布提高了OH-离子的迁移效率;70℃时No.3膜表现出最高的OH-离子电导率(3.02×10-2 S/cm),分别将其浸泡在2 mol/L、4 mol/L、6 mol/L的KOH溶液中进行耐碱稳定性测试,未见电导率下降,升高碱液浓度至8 mol/L,其电导率在120 h后稳定在初始值的88%左右,表现出优异的耐碱稳定性能。A series of poly(vinyl alcohol)(PVA)membranes functionalized by pyridinium groups with conjugate structure were prepared,of which the maximum substitution(No.3 membrane)is 10.4%determined by N-element analysis.Pyridinium groups are grafted onto the backbone of PVA chains which improves the migration efficiency of OH-ions.The introduction of pyridinium groups increases the initial thermal degradation temperature by nearly 32℃.The anionic conductivity of these membranes can be as high as 3.02×10-2 S/cm at 70℃.The anionic conductivity of No.3 membrane shows no decrease after immersing in 2 mol/L,4 mol/L and 6 mol/L KOH solution,when the concentration is increased to 8 mol/L,the anionic conductivity is finally stable at about 88%of the initial ionic conductivity which shows an excellent alkaline resistant stability.

关 键 词：离子交换 膜 耐碱稳定性 燃料电池 取代度 聚乙烯醇 

分 类 号：TQ325.9[化学工程—合成树脂塑料工业]