Metal-organic polyhedra as dynamic cross-linker for recyclable mixed matrix membranes with promising dimension stability  

作　　者：Linjie Lan Mingxin Zhang Haiyan Xiao Wei Liu-Fu Yuyan Lai Jiadong Chen Jia-Fu Yin Panchao Yin 

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,China [2]State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan Provincial Key Lab of Fine Chemistry,School of Chemical Engineering and Technology,Hainan University,Haikou 570228,China

出　　处：《Science China Chemistry》2025年第2期705-713,共9页中国科学(化学英文版)

基　　金：supported by the National Natural Science Foundation of China (22241501, 92261117);the Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology;the Open Fund of the China Spallation Neutron Source Songshan Lake Science City (DG24313519);the TCL Science and Technology Innovation Fund;Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices

摘　　要：Mixed matrix membranes(MMMs)are designed by incorporating microporous inorganic fillers into polymer matrix for the integration of inorganics’excellent gas separation performance with polymers’promising flexibility.However,due to the complex interphase interaction,the prevention of long-term aging is still challenging and the poor processability/recyclability of MMMs hinders their extensive applications.Herein,a coordination assembly protocol is developed for the fabrication of MMMs with both excellent processability/recyclability upon thermal annealing and promising dimension stability even under high gas pressure.Polymers bearing isophthalic acid(IPA)as side chains are applied to coordinate with Cu^(2+)and the assembled 2.5 nm microporous metal-organic polyhedra(MOP),{Cu_(24)IPA_(24)},serves as multi-functional cross-linkers for the polymer network formation.The MOPs’well-defined microporosity grants MMMs the capability for O_(2)/N_(2) separation while their activated dynamics at high temperatures(>120℃)endows polymer networks with excellent processability.In contrast to conventional supramolecular units,the MOPs possess unique logarithmic ligand-exchange kinetics and they show nearly frozen bonding dynamics at room temperature,ensuring promising dimensional stability to overcome the long-term aging and high gas pressure effect.This work not only provides fundamental understanding of the unique relaxation dynamics of complex systems with intertwined dynamics of supramolecular bonds and polymer chains,but also paves new avenues for the fabrication of robust and recyclable MMMs and elastomers.

关 键 词：dynamic bonding metal-organic polyhedra mixed matrix membrane polymer recycling gas separation 

分 类 号：TQ051.893[化学工程]