High ionic conductivity for ionic and poly ionic liquids based on 1-(hydroxyethyl)-3-vinylimidazolium cation: Asymmetric acidic anion contribution of hydrogen sulfate and dihydrogen phosphate

Hadjer Guettaf , Yassine Chaker , El Habib Belarbi , Mansour Debdab , Taqiyeddine Moumene , Abdelkader Benabdellah , Serge Bresson
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Abstract

The outstanding characteristics of ionic liquids (ILs), combined with the mechanical stability of polymeric systems, give rise to a novel class of materials known as polymeric ionic liquids (PILs) with transformative potential applications. The study aimed to investigate the influence of asymmetric acidic anions on the ionic conductivity of monomeric ionic liquid MILs and PILs. Therefore, an anion exchange reaction was carried out on 1-hydroxyethyl-3-vinylimidazolium chloride [EtOHVIM]Cl, resulting in the formation of 1-hydroxyethyl-3-vinylimidazolium hydrogen sulfate [EtOHVIM][HSO4]. Since a previous investigations highlighted the intriguing characteristics of dihydrogen phosphate anion, an additional anion exchange reaction was performed on Poly(1-hydroxyethyl-3-vinylimidazolium) chloride [P-EtOHVIM]Cl, which gave rise to the formation of Poly(1-hydroxyethyl-3-vinylimidazolium) dihydrogen phosphate [P-EtOHVIM][H2PO4], resulting in the formation of Poly (1-hydroxyethyl-3-vinylimidazolium) dihydrogen phosphate [P-EtOHVIM][H2PO4]. The molecular structures were confirmed using 1H NMR, 13C NMR, and Infrared (ATR/FTIR) spectroscopy. The obtained ionic liquids were analysed using Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), and Derivative Thermogravimetry (DTG). The findings revealed that these compounds have intriguing thermal properties, including a low glass transition temperature and good thermal stability. Furthermore, Broadband Dielectric Spectroscopy (BDS) analysis and thermal characterisations were combined to unravel the interplay between charge transport and glassy dynamics.

Abstract Image

基于1-(羟乙基)-3-乙烯基咪唑阳离子的离子和聚离子液体的高离子导电性:硫酸氢和磷酸二氢的不对称酸性阴离子贡献
离子液体(ILs)的突出特性,结合聚合物体系的机械稳定性,产生了一类被称为聚合物离子液体(pil)的新型材料,具有变革性的应用潜力。本研究旨在探讨不对称酸性阴离子对单体离子液体mil和pil离子电导率的影响。因此,对1-羟乙基-3-乙烯基咪唑氯[EtOHVIM]Cl进行阴离子交换反应,生成1-羟乙基-3-乙烯基咪唑硫酸氢[EtOHVIM][HSO4]。由于先前的研究强调了磷酸二氢阴离子的有趣特性,因此在聚(1-羟乙基-3-乙烯基咪唑)氯[P-EtOHVIM]Cl上进行了额外的阴离子交换反应,形成聚(1-羟乙基-3-乙烯基咪唑)磷酸二氢[P-EtOHVIM][H2PO4],从而形成聚(1-羟乙基-3-乙烯基咪唑)磷酸二氢[P-EtOHVIM][H2PO4]。分子结构通过1H NMR、13C NMR和红外(ATR/FTIR)光谱进行确证。用差示扫描量热法(DSC)、热重法(TGA)和导数热重法(DTG)对所得离子液体进行了分析。研究结果表明,这些化合物具有有趣的热性能,包括低玻璃化转变温度和良好的热稳定性。此外,宽带介电光谱(BDS)分析和热特性相结合,揭示了电荷输运和玻璃动力学之间的相互作用。
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CiteScore
3.70
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