Design of interchain hydrogen bond in polyimide membrane for improved gas selectivity and membrane stability
Design of interchain hydrogen bond in polyimide membrane for improved gas selectivity and membrane stability
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聚酰亚胺膜中链间氢键的设计以提高气体选择性和膜稳定性
DOI：
10.1016/j.memsci.2020.118659
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发表时间：
2021-01
影响因子：
9.5
通讯作者：
Jin Jian
中科院分区：
文献类型：
--
作者：
Wu Shanshan;Liang Jiachen;Shi Yapeng;Huang Menghui;Bi Xiangyu;Wang Zhenggong;Jin Jian
聚酰亚胺作为气体分离的潜在材料已被广泛研究。由于链堆积密度和链刚度的增加，聚酰亚胺的后交联可以提高气体选择性和膜稳定性。然而，常见的交联策略往往会破坏聚酰亚胺的化学结构。在这项工作中，通过引入间苯二甲酸二酰肼（IPD）分子作为交联剂，设计了6FDA-都烯聚酰亚胺（Du-PI）膜的聚合物链之间的强氢键。 Du-PI和IPD之间氢键的形成增强了聚合物链间相互作用并调节链间距，但不破坏Du-PI的化学结构。与原始的 Du-PI 膜相比，所得的 IPD/Du-PI 膜显着增强了机械强度和抗塑化性能。此外，由于聚合物链堆积密度的增加，在20% IPD/Du-PI膜的情况下，膜对H2/N2、H2/CH4、H2/CO2、O2/N2和CO2/CH4气体对的气体渗透选择性明显增加296%、505%、125%、66%和171%。本文已证明使用IPD作为交联剂是一种简便有效的策略，可以增强聚合物链之间的相互作用，同时以温和的方式提高膜稳定性。
Polyimide has been widely investigated as a potential material for gas separation. The post-crosslinking of polyimide could increase gas selectivity and membrane stability due to increase of chain-packing density and chain stiffness. However, common crosslinking strategies tend to destroy the chemical structure of polyimide. In this work, a strong hydrogen bond among polymer chains of 6FDA-durene polyimide (Du-PI) membranes is designed by introducing isophthalic dihydrazide (IPD) molecules as cross-linker. The formation of hydrogen bond between Du-PI and IPD strengthens the polymer interchain interaction and regulates interchain spacing but without breaking the chemical structure of Du-PI. The resulting IPD/Du-PI membranes exhibit largely enhanced mechanical strength and anti-plasticization property in comparison with pristine Du-PI membranes. In addition, due to the increased packing density of polymer chains, the membranes show obviously increased gas perm-selectivity by 296%, 505%, 125%, 66%, and 171% for H2/N2, H2/CH4, H2/CO2, O2/N2, and CO2/CH4gas pair in the case of 20% IPD/Du-PI membrane. The use of IPD as cross-linker has demonstrated herein to be a facile and effective strategy to strengthen the inter-polymer chain interaction and simultaneously improve membrane stability in a mild way.
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DOI：
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