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Preparation and gas separation performance of mixed-matrix membranes based on triptycene-containing polyimide and zeolite imidazole framework (ZIF-90)
Polymer ( IF 4.6 ) Pub Date : 2017-10-21 , DOI: 10.1016/j.polymer.2017.10.040
Qinnan Zhang , Shuangjiang Luo , Jennifer R. Weidman , Ruilan Guo

Defect-free mixed-matrix membranes (MMMs) based on triptycene-containing polyimide and zeolite imidazole framework (ZIF-90) were prepared in systematically varied compositions using priming and solution-casting method for gas separation. Microstructure analyses confirm that hierarchical triptycene units effectively assist in the nanoparticle dispersion and prevent aggregation, which, in conjunction with the favorable interactions between the organic ligands in ZIF-90 and imide moieties, construct desired interfacial morphology. MMMs showed significantly improved permeabilities (e.g., about three times of the pure polymer at 50 wt% loading) with negligible selectivity loss, which drives the separation performance laterally approaching and eventually surpassing the permeability-selectivity upper bound. Solubility and diffusivity analyses indicate that ZIF-90 nanoparticles facilitate fast gas diffusion through their microporous structure and increasing fractional free volume. The good agreement between experimental data and the Maxwell model prediction supports the ideal interfacial contact, demonstrating the great potential of iptycene structure in the development of high performance nanocomposite materials.



中文翻译:

含三萜烯的聚酰亚胺和沸石咪唑骨架的混合基质膜的制备和气体分离性能(ZIF-90)

使用底涂和溶液浇铸方法以系统变化的组成制备了基于含三萜烯的聚酰亚胺和沸石咪唑骨架(ZIF-90)的无缺陷混合基质膜(MMM),用于气体分离。微观结构分析证实,分层的三并茂单元可有效帮助纳米颗粒分散并防止聚集,这与ZIF-90中有机配体与酰亚胺部分之间的良好相互作用相结合,可构建所需的界面形态。MMM显示出显着改善的渗透率(例如,在50wt%负载下约为纯聚合物的三倍),选择性损失可忽略不计,这驱使分离性能横向接近并最终超过了渗透率选择性上限。溶解度和扩散性分析表明ZIF-90纳米颗粒通过其微孔结构和增加的自由体积分数促进了气体的快速扩散。实验数据与麦克斯韦模型预测之间的良好一致性支持了理想的界面接触,证明了并茂结构在高性能纳米复合材料开发中的巨大潜力。

更新日期:2017-10-21
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