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

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED Reactive & Functional Polymers Pub 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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Abstract

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.