Martins Ana P S, Fdz De Añastro Asier, Olmedo-Martínez Jorge L, Nabais Ana R, Neves Luísa A, Mecerreyes David, Tomé Liliana C
POLYMAT, University of the Basque Country UPV/EHU, Joxe Mari Korta Center, Avda. Tolosa 72, 20018 Donostia-San Sebastian, Spain.
Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, 2780-157 Oeiras, Portugal.
Membranes (Basel). 2020 Mar 17;10(3):46. doi: 10.3390/membranes10030046.
Iongel-based CO separation membranes were prepared by fast (< 1 min) UV-initiated polymerization of poly(ethylene glycol) diacrylate (PEGDA) in the presence of different ionic liquids (ILs) with the [Cmim] cation and anions such as [TFSI], [FSI], [C(CN)] and [B(CN)]. The four ILs were completely miscible with the non-ionic PEGDA network. Transparent and free-standing iongels containing between 60 and 90 %wt of IL were obtained and characterized by diverse techniques (FTIR, TGA, DSC, DMTA, SEM, CO solubility and pure gas permeability). The thermal and mechanical stability of the iongels, as well as CO solubility, were found to be strictly dependent on the IL content and the anion's nature. The TGA results indicated that the iongels mostly follow the thermal profile of the respective neat ILs. The DMTA analysis revealed that the iongels based on fluorinated anions have higher storage modulus than those of cyano-functionalized anions. Conversely, the PEGDA-C(CN) iongels presented the highest CO solubility values ranging from 72 to 80 mmol/g. Single CO permeabilities of 583 ± 29 Barrer and ideal CO/N selectivities of 66 ± 3 were obtained with the PEGDA-70 C(CN) iongel membrane. This work demonstrates that the combination of PEGDA with high contents of the best performing ILs is a promising and simple strategy, opening up new possibilities in the design of high-performance iongel membranes for CO separation.
通过在含有不同离子液体（ILs）（阳离子为[Cmim]，阴离子为[TFSI]、[FSI]、[C(CN)]和[B(CN)]）的情况下，快速（<1分钟）紫外引发聚乙二醇二丙烯酸酯（PEGDA）聚合，制备了基于离子凝胶的CO分离膜。这四种离子液体与非离子PEGDA网络完全互溶。获得了IL含量在60%至90%重量之间的透明且自立的离子凝胶，并通过多种技术（傅里叶变换红外光谱、热重分析、差示扫描量热法、动态热机械分析、扫描电子显微镜、CO溶解度和纯气渗透率）对其进行了表征。发现离子凝胶的热稳定性和机械稳定性以及CO溶解度严格取决于IL含量和阴离子的性质。热重分析结果表明，离子凝胶大多遵循各自纯离子液体的热曲线。动态热机械分析表明，基于氟化阴离子的离子凝胶比氰基官能化阴离子的离子凝胶具有更高的储能模量。相反，PEGDA-C(CN)离子凝胶的CO溶解度最高，范围为72至80 mmol/g。PEGDA-70 C(CN)离子凝胶膜的单一CO渗透率为583±29 Barrer，理想的CO/N选择性为66±3。这项工作表明，PEGDA与高含量性能最佳的离子液体相结合是一种有前景且简单的策略，为设计用于CO分离的高性能离子凝胶膜开辟了新的可能性。
