Ultrapermeable membranes based on connected cluster of hollow polydimethylsiloxane nanoparticles for gas separation  

作　　者：Xiaoli Ding Fangfang Tan Hongyong Zhao Qingping Xin Yuzhong Zhang 

机构地区：[1]State Key Laboratory of Separation Membranes and Membrane Processes,National Center for International Joint Research on Separation Membranes,Tiangong University,Tianjin,300387,China [2]Tianjin Key Laboratory of Hollow Fiber Membrane Materials and Processes(Tiangong University),Tianjin,300387,China

出　　处：《Particuology》2023年第8期45-53,共9页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(grant No.21776217 and 21978214).

摘　　要：Mixed matrix membranes(MMMs)with the performance between the matrix and the filler is a promising strategy for membranes with excellent gas permeability-selectivity.In this study,the hollow polydimethylsiloxane nanoparticles were synthesized and then incorporated with the poly(oxide ethylene)monomer and tri-functional cross-linker to form mixed matrix membranes by in situ poly-merization.The hollow nanoparticles formed the independent closed nanocavities in membranes,which enhanced the gas permeability contributed by both the improved diffusivity and solubility.At high loading,the hollow polydimethylsiloxane nanoparticle was converted into the continuous phase with the cross-linked poly(oxide ethylene)as the dispersed phase.Gases preferred to permeate through the connected cluster of hollow polydimethylsiloxane nanoparticles,finally leading to ultrahigh gas per-meabilities far going beyond the instinct values of polydimethylsiloxane and the cross-linked poly(oxide ethylene).The optimized membrane with 34 wt%hollow nanoparticles loadings exhibited ultrahigh permeabilities with the values of 44186 Barrer for CO_(2) and 11506 Barrer for O_(2),accompanied with a CO_(2)/N_(2) selectivity of 9.9 and an O_(2)/N_(2) selectivity of 2.6,which exceeded the 2008 Robeson upper bound for O_(2)/N_(2) and located at the 2008 Robeson upper bound for CO_(2)/N_(2).

关 键 词：Hollow nanoparticles Polydimethylsiloxane nanoparticles Mixed matrix membranes NANOCAVITY Gas separation 

分 类 号：O63[理学—高分子化学]