Using iron (III) acetylacetonate as both a cross-linker and micropore former to develop polyimide membranes with enhanced gas separation performance
Using iron (III) acetylacetonate as both a cross-linker and micropore former to develop polyimide membranes with enhanced gas separation performance
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DOI：
10.1016/j.seppur.2014.06.039
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发表时间：
2014-09-08
影响因子：
8.6
通讯作者：
Chung, Tai-Shung
中科院分区：
文献类型：
--
作者：
Chua, Mei Ling;Xiao, Youchang;Chung, Tai-Shung
交联聚合物链已被证明是改善其气体分离性能和抗塑化性的可行方法之一，但往往以牺牲渗透性为代价。在这项研究中，试图交联聚酰亚胺（PI），而不牺牲膜的渗透性是通过采用离子热不稳定的单位，铁（III）乙酰丙酮（FeAc），加上低温退火。特别地，不仅建立了交联网络，与原始PI膜相比，PI-6wt%FeAc膜的渗透性增加超过88%。渗透率的提高是由于溶解度和扩散系数的增加。在纯CO2和二元CO2/CH 4气体测试中，改性膜还显示出改善的抗CO2增塑性。采用TGA、DSC、FTIR、凝胶含量和密度测量等多种表征技术研究了PI-FeAc膜在交联和退火过程中的结构变化。研究了一种适度后热处理的聚酰亚胺膜与乙酰丙酮铁（III）的共混物，该膜具有增强的气体分离性能，改善的CO2增塑性能和在混合气体下的良好稳定性。(C)2014爱思唯尔有限公司版权所有。
Cross-linking polymer chains has proved to be one of the feasible ways to improve its gas separation performance and plasticization resistance, but often at the expense of permeability. In this study, an attempt to cross-link a polyimide (PI) without sacrificing the permeability of the membrane is made by employing an ionic thermally labile unit, iron (III) acetylacetonate (FeAc), coupled with low temperature annealing. Particularly, not only a cross-linked network is established, an increment of more than 88% in permeability is attained for the PI-6 wt% FeAc membrane as compared to pristine PI membrane. The permeability enhancement is resulted from increments in both solubility and diffusivity coefficients. The modified membranes also show improved resistance to CO2 plasticization in both pure CO2 and binary CO2/CH4 gas tests. Various characterization techniques such as TGA, DSC, FTIR, gel content and density measurement were employed to elucidate the structural changes of the PI-FeAc membranes during the cross-linking and annealing processes. A moderate post thermally treated polyimide membranes blended with iron (III) acetylacetonate with enhanced gas separation performance, improved CO2 plasticization resistance and good stability under mixed gas has been developed. (C) 2014 Elsevier B.V. All rights reserved.