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离子型聚酰亚胺膜制备及其镁锂分离性能

作者：李厚阳，马小华，李建新

单位： 1. 天津工业大学材料科学与工程学院，天津 300387； 2. 天津工业大学分离膜与膜过程国家重点实验室，天津 300387

关键词：冠醚；苯并咪唑；聚酰亚胺；镁锂选择分离

DOI号： 10.16159/j.cnki.issn1007-8924.2024.06.001

分类号： TQ028

出版年,卷(期):页码： 2024,44(6):1-9

摘要：

以二氨基二苯并-14-冠-4（DAB14C4）、2-（3,5-二氨基苯基）-苯并咪唑（DABI）与4,4-六氟异丙基邻苯二甲酸酐（6FDA）为单体，通过缩聚反应、季铵化反应、离子交换反应制备了一种新型聚酰亚胺聚合物.采用NIPS法制备聚合物多孔膜，并进行离子扩散实验.结果表明，成功合成冠醚-咪唑基离子型聚酰亚胺（PI-C-IL-NTf2），其冠醚固载量为0.97 mmol/g，咪唑固载量为0.51 mmol/g，NTf-2阴离子取代度为72%，分子量为30 000，玻璃化转变温度为170.1℃.制备的聚合物多孔膜结构为上层致密，支撑层为均匀贯穿的通孔；平均孔径为(8.95±0.4) nm，孔隙率为(74.8±0.7)%，机械强度为5.2 MPa，纯水接触角为71.2°，纯水渗透率为285 L/(m2·h·MPa).多孔膜对Li+和Mg2+渗透速率分别为0.258和0.0455 μm/s，Li/Mg分离因子为9.49.

In order to meet the increasing demand for lithium resources, diaminodibenzo-14-crown-4(DAB14C4), 2-(3,5-diaminophenyl)-benzimidazole (DABI) and 4,4-hexafluoroisopropyl phthalic anhydride (6FDA) were used. A novel polyimide polymer was prepared by polycondensation, quaternization and ion exchange reaction. Polymer porous membranes were prepared by NIPS method, and ion diffusion experiments were carried out. The results showed that crown ether-imidazole-based ionic polyimide polymer (PI-C-IL-NTf2) was successfully synthesized. The crown ether immobilization amount of PI-C-IL-NTf2 was 0.97 mmol/g, the imidazole immobilization amount was 0.51 mmol/g, NTf-2 anion substitution degree was 72%, molecular weight was 30 000, and glass transition temperature was 170.1 ℃. The prepared polymer porous membrane structure was dense in the upper layer, and the support layer was a through-hole structure that penetrates evenly; the average pore size was (8.95±0.4) nm, the porosity was (74.8±0.7)%, the mechanical strength was 5.2 MPa, the pure water contact angle was 71.2°, and the pure water permeability was 285 L/(m2·h·MPa). The permeation rates of porous membrane for Li+ and Mg2+ were 0.258 μm/s and 0.0455 μm/s respectively, and the Li/Mg separation factor was 9.49.

基金项目：

国家自然科学基金项目（22278318）

作者简介：

李厚阳（1999-），女，山东枣庄人，硕士生，主要研究方向为膜分离

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