Modulating Polymer Dynamics via Supramolecular Interaction with Ultrasmall Nanocages for Recyclable Gas Separation Membranes with Intrinsic Microporosity
Modulating Polymer Dynamics via Supramolecular Interaction with Ultrasmall Nanocages for Recyclable Gas Separation Membranes with Intrinsic Microporosity
复制标题
通过与超小纳米笼的超分子相互作用调节聚合物动力学，用于具有固有微孔性的可回收气体分离膜
DOI：
10.1021/acs.nanolett.1c02379
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发表时间：
2021
期刊：
影响因子：
10.8
通讯作者：
Yin Panchao
中科院分区：
文献类型：
--
作者：
Liu Yuan;Cai Linkun;Ma Litao;Li Mu;Yang Junsheng;Chen Kun;Yin Panchao
混合基质膜的工程设计受到机械性能和无机填料微孔性有效利用之间的权衡的严重阻碍。在此，我们报告了一种最佳气体分离膜的可行方法，通过强超分子相互作用用聚（4-乙烯基吡啶）（P4VP）制造配位纳米笼，使纳米笼均匀分散在聚合物基质中并具有长期结构稳定性。同时，动力学研究表明，P4VP 和纳米笼之间的强大吸引力会减慢聚合物动力学并使聚合物链刚性化，导致堆积受阻并降低聚合物基体的密度。这种效应使得外部气体分子能够进入纳米笼的微孔，从而有助于纳米复合材料的固有微孔性并同时增强选择性渗透性。超分子合成和聚合物动力学衰减的简便策略为合理设计用于气体分离应用的功能杂化膜铺平了道路。
The engineering of mixed-matrix membranes is severely hindered by the trade-off between mechanical performance and effective utilization of inorganic fillers’ microporosity. Herein, we report a feasible approach for optimal gas separation membranes through the fabrication of coordination nanocages with poly(4-vinylpyridine) (P4VP) via strong supramolecular interactions, enabling the homogeneous dispersion of nanocages in polymer matrixes with long-term structural stability. Meanwhile, suggested from dynamics studies, the strong attraction between P4VP and nanocages slows down polymer dynamics and rigidifies the polymer chains, leading to frustrated packing and lowered densities of the polymer matrix. This effect allows the micropores of nanocages to be accessible to external gas molecules, contributing to the intrinsic microporosity of the nanocomposites and the simultaneous enhancement of permselectivities. The facile strategy for supramolecular synthesis and polymer dynamics attenuation paves avenues to rational design of functional hybrid membranes for gas separation applications.