Surface modification of ZIF‐90 with triptycene for enhanced interfacial interaction in mixed‐matrix membranes for gas separation,Journal of Polymer Science

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Surface modification of ZIF‐90 with triptycene for enhanced interfacial interaction in mixed‐matrix membranes for gas separation
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-08-25 , DOI: 10.1002/pol.20200123
Qinnan Zhang ₁ , Shuangjiang Luo ₂ , Jennifer Weidman ₁ , Ruilan Guo ₁

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Zeolite imidazole framework (ZIF‐90) nanoparticles were chemically modified by grafting triptycene moieties. The modified nanoparticles were introduced into a triptycene‐based polyimide as fillers to generate mixed matrix membranes (MMMs) for gas separation. The incorporation of “hook‐like” triptycene moieties in both dispersed and continuous phases led to intimate contact between the two phases and thus defect‐free interfacial morphology, due to the supramolecular interlocking and π–π stacking interaction between triptycene units presented in both phases. The filler/polymer solution showed shear thickening behavior due to such strong interfacial interaction. The separation performance of the prepared composite membranes was investigated as a function of filler loading and particle surface grafting density. Pure‐gas permeation results showed that the gas permeabilities increased expectedly as the filler loading increased, with stable or improved selectivities. The reduced permeability relative to pristine polyimide film is likely due to the pore blockage of ZIF‐90 upon grafting triptycene moieties on the particle surface. Reducing the grafting density of triptycene moieties led to improved permeability and selectivity suggesting good tunability of this series of new composite membranes. Overall, modification of nanofiller with hierarchical triptycene moieties offers a fundamentally new avenue for creation of composite membranes with unique properties in gas separations.

中文翻译：

ZIF-90的三萜烯表面改性，可增强混合基质膜中的界面相互作用，从而实现气体分离

沸石咪唑骨架（ZIF-90）纳米粒子通过接枝三茂基部分进行了化学修饰。将改性后的纳米颗粒作为填充剂引入基于三萜的聚酰亚胺中，以生成用于气体分离的混合基质膜（MMM）。在分散相和连续相中掺入“钩状”三茂基部分，导致两相之间紧密接触，因此无缺陷的界面形态，这是由于在两个相中存在的三茂分子单元之间的超分子互锁和π-π堆积相互作用。填料/聚合物溶液由于这种强的界面相互作用而表现出剪切增稠行为。研究了制备的复合膜的分离性能与填料含量和颗粒表面接枝密度的关系。纯气渗透的结果表明，随着填料含量的增加，气体的渗透率有望提高，而选择性或稳定或提高。相对于原始聚酰亚胺薄膜，渗透性降低的原因可能是由于在颗粒表面接枝三茂基部分时ZIF-90的孔堵塞。降低三并茂结构部分的接枝密度可提高通透性和选择性，这表明该系列新型复合膜具有良好的可调谐性。总体而言，用递进的三茂基结构部分修饰纳米填料为从根本上提供了一种新的途径，以创建在气体分离中具有独特性能的复合膜。相对于原始聚酰亚胺薄膜，渗透性降低的原因可能是由于在颗粒表面接枝三茂基部分时ZIF-90的孔堵塞。降低三并茂结构部分的接枝密度可提高通透性和选择性，这表明该系列新型复合膜具有良好的可调谐性。总体而言，用递进的三萜烯结构部分修饰纳米填料为从根本上提供了一种新的途径，以创建在气体分离中具有独特性能的复合膜。相对于原始聚酰亚胺薄膜而言，渗透性降低的原因可能是由于在颗粒表面接枝三茂基部分时ZIF-90的孔堵塞。降低三并茂结构部分的接枝密度可提高通透性和选择性，这表明该系列新型复合膜具有良好的可调谐性。总体而言，用递进的三茂基结构部分修饰纳米填料为从根本上提供了一种新的途径，以创建在气体分离中具有独特性能的复合膜。

更新日期：2020-09-16

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