O'Harra Kathryn E, Kammakakam Irshad, Devriese Emily M, Noll Danielle M, Bara Jason E, Jackson Enrique M
Department of Chemical & Biological Engineering, University of Alabama, Tuscaloosa, AL 35487-0203, USA.
NASA Marshall Space Flight Center, Huntsville, AL 35812, USA.
Membranes (Basel). 2019 Jul 3;9(7):79. doi: 10.3390/membranes9070079.
Three new isomeric 6FDA-based polyimide-ionenes, with imidazolium moieties and varying regiochemistry ( connectivity), and composites with three different ionic liquids (ILs) have been developed as gas separation membranes. The structural-property relationships and gas separation behaviors of the newly developed 6FDA polyimide-ionene + IL composites have been extensively studied. All the 6FDA-based polyimide-ionenes exhibited good compatibility with the ILs and produced homogeneous hybrid membranes with the high thermal stability of ~380 °C. Particularly, [6FDA I4A pXy][TfN] ionene + IL hybrids having [Cmim][TfN] and [Bnmim][TfN] ILs offered mechanically stable matrixes with high CO affinity. The permeability of CO was increased by factors of 2 and 3 for Cmim and Bnmim hybrids (2.15 to 6.32 barrers), respectively, compared to the neat [6FDA I4A pXy][TfN] without sacrificing their permselectivity for CO/CH and CO/N gas pairs.
三种新型基于6FDA的聚酰亚胺离子烯，带有咪唑鎓部分且区域化学（连接性）不同，以及与三种不同离子液体（ILs）的复合材料已被开发用作气体分离膜。新开发的6FDA聚酰亚胺离子烯+IL复合材料的结构-性能关系和气体分离行为已得到广泛研究。所有基于6FDA的聚酰亚胺离子烯都与ILs表现出良好的相容性，并制备出具有约380℃高热稳定性的均匀混合膜。特别地，含有[Cmim][TfN]和[Bnmim][TfN] ILs的[6FDA I4A pXy][TfN]离子烯+IL混合物提供了对CO具有高亲和力的机械稳定基质。与不含ILs的纯[6FDA I4A pXy][TfN]相比，对于Cmim和Bnmim混合物，CO的渗透率分别提高了2倍和3倍（从2.15至6.32巴），同时不牺牲它们对CO/CH和CO/N气体对的选择性。
