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-b-PVIm)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 mS/cm和255.0mS/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)8 were followed subsequently to prepare anion exchange membranes (AEM),marked as PMV-1 and PMV-2.The water uptake (WU),swelling degree (SD),mechanical property,ion exchange capacity (IEC),conductivity (σ) 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,σ 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,σ of PMV-1 membranes decreases no more than 30％.
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