含咪唑聚离子液体的星型POSS嵌段共聚物基阴离子交换膜的制备与性能  

Preparation and Characterization of Anion Exchange Membrane Based on Polyhedral Oligomeric Silsesquioxane Star-Shaped Block Copolymers Containing Imidazolium Polymerized Ionic Liquid

作　　者：孙坤[1] 陈芳[1] 马晓燕[1] 张杰[1] 张帆[1] 管兴华[1] 

机构地区：[1]西北工业大学理学院,陕西西安710129

出　　处：《高分子材料科学与工程》2017年第3期128-132,共5页Polymer Materials Science & Engineering

基　　金：陕西省自然科学基金资助项目(2013JQ2010;2013JM2012);陕西省科技统筹创新工程计划项目(2016KTZDGY10-01)

摘　　要：以聚甲基丙烯酸甲酯嵌段聚乙烯基咪唑为臂,低聚倍半硅氧烷(POSS)为核的星型嵌段共聚物POSS-(PMMA-bPVIm)8为基膜材料,通过季铵化反应和离子交换过程对其进行改性,制备2种咪唑聚离子液体嵌段不同的阴离子交换膜,分别记作PMV-1、PMV-2,研究其吸水率、溶胀度、离子交换容量、力学性能、电导率及耐碱性。结果表明,膜在90℃时仍保持适当的吸水强度,2种膜的吸水率分别为18.09%和25.81%,厚度方向溶胀度分别为25.31%,35.45%;30℃时PMV-1、PMV-2的离子交换容量分别为2.38 meq/g,3.12 meq/g,力学性能良好;2种膜室温下均已具有良好的离子传输性能,90℃时电导率分别达44.02 m S/cm和255.0 m S/cm;耐碱性测试表明,含聚离子液体嵌段较短的膜PMV-1稳定性较好,60℃强碱溶液中浸泡120 h后电导率下降不超过30%。Two polyhedral oligomeric silsesquioxane （POSS） star-shaped block copolymers POSS-（ PMMA-b- PVIm）8 with different PVIm blocks were synthesized, with POSS as intramolecular crosslinking point, polymethyl methacrylate （PMMA） and polyvinylimidazole （PVIm） as two blocks. Quaternization reaction and ion exchanging process of POSS-（PMMA-b-PVIm）s were followed subsequently to prepare anion exchange membranes （AEM）, marked as PMV-i and PMV-2. The water uptake （WU）, swelling degree （SD）, mechanical property, ion exchange capacity （IEC）, conductivity （a） of the two membranes were investigated. The WU and SD still remain appropriate level even at 90 ℃, the WU is 18.09 % and 25.81%, the SD in the width is just 25.31% and 35.45 % respectively. IEC of the membranes at 30 ℃ is 2.38 meq/g and 3.12 meq/g respectively. Both membranes exhibit good mechanical property and excellent conductivity, a could reach 44.0 mS/cm and 255.0 mS/cm at 90 ℃. After immersion in 1 mol/L NaOH solution at 60℃ for 120 h, a of PMV-1 membranes decreases no more than 30%.

关 键 词：咪唑聚离子液体 阴离子交换膜 电导率 低聚倍半硅氧烷 

分 类 号：TB383[一般工业技术—材料科学与工程]