Examining ionicity and conductivity in poly(methyl methacrylate) containing imidazolium-based ionic liquids
Examining ionicity and conductivity in poly(methyl methacrylate) containing imidazolium-based ionic liquids
复制标题
检查含咪唑基离子液体的聚（甲基丙烯酸甲酯）的离子性和电导率
DOI：
10.1016/j.molliq.2023.121897
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发表时间：
2023
影响因子：
6
通讯作者：
Akcora, Pinar
中科院分区：
文献类型：
--
作者：
Li, Ruhao;Feng, Yi;Akcora, Pinar
离子液体（IL）与非晶态聚合物或聚电解质的相互作用吸引了人们的兴趣，因为它们倾向于形成具有更高粘度和更低离子电导率的离子凝胶。为了设计更好的基于IL的杂化电解质，需要对聚合物和IL之间的相互作用有一个很好的理解。本研究考察了il -聚合物电解质与相对低聚合物浓度的混合物，以提高其导电性。研究了三种咪唑基离子液体在线性聚甲基丙烯酸甲酯（PMMA）均聚物的加入下的离子输运性质。PMMA/IL混合物的介电性能表明，IL的表观离子性增强，这是由于PMMA与双（三氟甲基磺酰）亚胺（TFSI-）阴离子之间的优先相互作用所致。通过Jonscher通用幂律分析的频率相关电导率数据推断，PMMA和IL之间的离子偶极子耦合相互作用有助于溶剂化，并通过破坏笼状结构和促进IL的快速离子运动来增强离子性。
Ionic liquid (IL) interactions with amorphous polymers or polyelectrolytes attract interests due to their propensity to form ionogels with enhanced viscosity and reduced ionic conductivity when compared to their neat IL. A good understanding on the interactions between polymer and IL is needed to design better IL-based hybrid electrolytes. This study examines the mixtures of IL-polymer electrolytes with relatively low polymer concentration to improve their conductivity. Ion transport properties of three types of imidazolium-based ionic liquids are investigated with the addition of linear poly(methyl methacrylate) (PMMA) homopolymer. Dielectric properties of PMMA/IL mixtures indicated the enhancement of apparent ionicity of ILs, which is attributed to the preferential interactions between PMMA and bis(trifluoromethylsulfonyl)imide (TFSI-) anions. The frequency-dependent conductivity data analyzed by the Jonscher universal power law infer that ion–dipole coupling interactions between PMMA and IL help in the solvation and enhance the ionicity by disrupting the cage structure and facilitating the fast ion motions of IL.