Controlled Superacid-Catalyzed Self-Cross-Linked Polymer of Intrinsic Microporosity for High-Performance CO2 Separation,Macromolecules

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Controlled Superacid-Catalyzed Self-Cross-Linked Polymer of Intrinsic Microporosity for High-Performance CO2 Separation
Macromolecules ( IF 5.1 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.macromol.0c01590
Shengyang Zhou _{1,

2} , Yuxuan Sun _{1,

2} , Boxin Xue _{1,

2} , Shenghai Li _{1,

2} , Jifu Zheng _{1,

2} , Suobo Zhang _{1,

2}

Affiliation

Polymers of intrinsic microporosity (PIMs) with superhigh permeability have been widely studied for higher selectivity in the various separation processes. However, the disorder and wide-distribution of pore size limit their molecule selectivity. In this work, at low temperature (60 °C), we design and prepare a superacid-induced self-cross-linked PIM-1 membrane with a rebuilt microstructure by swelling and catalysis of the superacid to achieve fast and accurate gas transport. For PIM-1 membranes, the polymer chains can be activated by CF₃SO₃H solvation to possess enhanced motion and reactivity. Then, the partial swelled porosities can be solidified with cross-linking of nitrile groups and further be interconnected by narrow channels to form alternating gas pathways, which was supported by X-ray diffraction and small-angle X-ray scattering. As a result, these cross-linked membranes maintain high gas permeability, even approaching to that of pristine PIM-1, and meanwhile exhibit excellent molecular sieving ability, such as CO₂/N₂ permeation selectivity increasing from 20.4 to 58.1. This indicates that superacid-catalyzed self-cross-linking can effectively adjust the topological structure of PIM-1 for microstructure-dependent applications including but not limited to CO₂ separation and fuel cells.

中文翻译：

可控超强酸催化固有性质的微孔自交联聚合物，用于高效CO ₂分离

具有超高渗透性的本征微孔性（PIM）聚合物已被广泛研究以在各种分离过程中提高选择性。然而，孔径的无序和广泛分布限制了它们的分子选择性。在这项工作中，我们在低温（60°C）下设计并制备了一种由超酸诱导的自交联PIM-1膜，该膜通过溶胀和催化超酸来重建微观结构，从而实现了快速，准确的气体传输。对于PIM-1膜，聚合物链可以被CF ₃ SO ₃活化H溶剂化具有增强的运动性和反应性。然后，可以通过腈基的交联来固化部分溶胀的孔隙，并进一步通过狭窄的通道相互连接，形成交替的气体通道，这由X射线衍射和小角度X射线散射来支持。结果，这些交联的膜保持高的气体渗透性，甚至接近原始的PIM-1的气体渗透性，同时表现出优异的分子筛分能力，例如CO ₂ / N _2的渗透选择性从20.4增加到58.1。这表明超酸催化的自交联可以有效地调节PIM-1的拓扑结构，以用于依赖于微结构的应用，包括但不限于CO ₂分离和燃料电池。

更新日期：2020-09-22

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