醋酸乙烯-离子液体乙烯基-丁基咪唑共聚物阴离子膜的合成、表征和离子电导率

IF 5.4 3区工程技术 Q1 CHEMISTRY, APPLIED Reactive & Functional Polymers Pub Date : 2025-03-01 Epub Date: 2024-12-31 DOI:10.1016/j.reactfunctpolym.2024.106148

Mónica Stephen Correa-Durán , María Ortencia González-Díaz , Rita Sulub-Sulub , María Isabel de los Dolores Loria-Bastarrachea , José M. Cervantes-Uc , Humberto Vázquez-Torres , Manuel Aguilar-Vega

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引用次数: 0

摘要

以离子液体单体1-（4-乙烯基苄基）-3-丁基咪唑四氟硼酸盐（VBIT）为阴离子交换基，采用乙酸乙烯酯（VAc）自由基共聚法制备了3种聚合物阴离子交换膜（AEMs）。采用FTIR、1H NMR和13C NMR对不同摩尔比（70:30、64:36和60:40）下的VBIT单体和共聚物pvbit -co- pvbit的化学结构进行了表征。DSC和TGA结果表明，PVAc-co-PVBIT共聚物具有Tg，热稳定性介于均聚物之间。PVAc-co-PVBIT膜具有较高的吸水率（165 ~ 631%），离子交换容量在2.11 ~ 2.52 meq g−1之间，离子电导率在1.9 ~ 5.0 × 10−2 mS cm−1之间。在大多数情况下，离子电导率（σ）和（IEC）值等于或高于报道的含有阴离子膜的商业或离子液体。暴露于3 M NaOH碱性溶液后，PVAc-co-PVBIT膜保持不变，重量损失最小。PVAc-co-PVBIT共聚物的成膜能力、热稳定性、离子交换容量和离子电导率值使其成为极有前途的阴离子膜制备材料。

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Anionic membranes from vinyl acetate and ionic liquid vinyl-butyl imidazolium (PVAc-co-PVBIT) copolymers: Synthesis, characterization and ionic conductivity

Three polymeric anion exchange membranes (AEMs) were synthesized via free radical copolymerization of vinyl acetate (VAc), with ionic liquid monomer 1-(4-vinylbenzyl)-3-butyl imidazolium tetrafluoroborate (VBIT) as the anion-exchange group. VBIT monomer and the copolymers PVAc-co-PVBIT chemical structure at different molar ratios (70:30, 64:36, and 60:40) were characterized by FTIR, ¹H NMR and ¹³C NMR spectroscopy. DSC and TGA results showed that PVAc-co-PVBIT copolymers exhibit Tg, as well as thermal stability intermediate between the homopolymers. PVAc-co-PVBIT membranes showed high water absorption (165–631 %), ion exchange capacity between 2.11 and 2.52 meq g⁻¹, and ionic conductivity between 1.9 and 5.0 × 10⁻² mS cm⁻¹. In most cases, ionic conductivity (

σ

) and (IEC) values were equal to or higher than those reported for commercial or ionic liquid containing anionic membranes. After exposure to 3 M NaOH alkaline solution, PVAc-co-PVBIT membranes remain unchanged with a minimum weight loss. The ability to form membranes, thermal stability, ion exchange capacity and ionic conductivity values of PVAc-co-PVBIT copolymers situate them as promising material for anionic membrane preparation.

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.