Synthesis and Performance of 6FDA-Based Polyimide-Ionenes and Composites with Ionic Liquids as Gas Separation Membranes
Synthesis and Performance of 6FDA-Based Polyimide-Ionenes and Composites with Ionic Liquids as Gas Separation Membranes
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DOI：
10.3390/membranes9070079
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发表时间：
2019-07-01
期刊：
影响因子：
4.2
通讯作者：
Jackson, Enrique M.
中科院分区：
文献类型：
--
作者：
O'Harra, Kathryn E.;Kammakakam, Irshad;Jackson, Enrique M.
已经开发了三种新的异构体6 FDA基聚酰亚胺-紫罗烯，其具有咪唑鎓部分和不同的区域化学（帕拉、Meta位和邻位连接性），以及具有三种不同离子液体（IL）的复合材料作为气体分离膜。研究了新型6 FDA聚酰亚胺-紫罗烯+离子液体复合材料的结构-性能关系和气体分离性能。所有6 FDA基聚酰亚胺-紫罗烯均表现出与离子液体良好的相容性，并产生具有类似于380 ℃的高热稳定性的均匀杂化膜。特别地，具有[C（4）mim][Tf 2N]和[Bnmim][Tf 2N] IL的[6 FDA I4 A pXy][Tf 2N]紫罗烯+ IL杂化物提供了具有高CO2亲和力的机械稳定基质。与纯的[6 FDA I4 A pXy][Tf 2N]相比，C（4）mim和Bnmim杂化物的CO2渗透性分别增加2倍和3倍（2.15至6.32巴），而不牺牲它们对CO2/CH 4和CO2/N-2气体对的选择渗透性。
Three new isomeric 6FDA-based polyimide-ionenes, with imidazolium moieties and varying regiochemistry (para-, meta-, and ortho- 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 similar to 380 degrees C. Particularly, [6FDA I4A pXy][Tf2N] ionene + IL hybrids having [C(4)mim][Tf2N] and [Bnmim][Tf2N] ILs offered mechanically stable matrixes with high CO2 affinity. The permeability of CO2 was increased by factors of 2 and 3 for C(4)mim and Bnmim hybrids (2.15 to 6.32 barrers), respectively, compared to the neat [6FDA I4A pXy][Tf2N] without sacrificing their permselectivity for CO2/CH4 and CO2/N-2 gas pairs.