類沸石咪唑酯框架(ZIF)是一種具有發展性的材料應用於膜的氣體分離，在我們的研究中，藉由核延續法以核-殼的結構將ZIF-8與ZIF-67結合而形成ZIF-67@ZIF-8，相較於ZIF-67，ZIF-67@ZIF-8展現出高比表面積、氣體吸附以及熱穩定性，將ZIF填充物加入6FDA-DAM搭配適當的溶劑去製備混合基材薄膜。為了瞭解核-殼結構的氣體分離機制，薄膜的製備占很重要的角色來獲得無缺陷的複合膜，包括膠體溶液、priming method與熱處理。均勻散佈的核-殼沸石咪唑酯框架複合膜提供氣體擴散更多的微孔的通道，氣體擴散的結果指出複合膜擁有非凡的氫氣通透性以及微小地增加對於氮氣與甲烷的選擇性，最好性能的核-殼沸石咪唑酯框架複核膜超越了氫氣與甲烷的2008羅伯森上限，核-層類沸石咪唑酯框架複核膜的現象不只適用於玻璃高分子，也適用於橡膠高分子。;Zeolitic imidazolate framework (ZIF) is a promising material in membrane technology for gas separation. In our work, ZIF-8 and ZIF-67 were synthesized in the form of core-shell structure (ZIF-67@ZIF-8) by the seed mediated growth method. ZIF-67@ZIF-8 nanocrystals present higher surface area, gas uptake and thermal stability in comparison with the core (ZIF-67). ZIF fillers were added into 6FDA-DAM with the proper solvent to fabricate mixed matrix membranes (MMMs). In order to realize the mechanism of the core-shell structure, the preparation of membrane plays an important role to obtain defect-free nanocomposite by the colloidal solution, priming method and annealing treatment. The well-dispersed core-shell ZIFs nanocomposites provide more microporous pathways for gas separation. The result of MMMs demonstrates a remarkable hydrogen permeability and the slight enhancement of selectivities against N2 and CH4. The highest performance of ZIF-67@ZIF-8 MMM surpasses the 2008 Robeson’s upper bound for H2/CH4. This effect of core-shell structure can be observed in glassy as well as rubbery polymer.
