有機金屬框架(Metal-organic framework, MOF)是一種常用於複合 薄膜的多孔性填料材料。相較於純膜的性質，在各種複合膜中以混合 基質薄膜(Mixed matrix membranes, MMMs)會有更佳優異的氣體輸送 及分離表現，而官能基化的有機金屬框架材料則有助於改善混合基質 薄膜的製備。MOF 上的官能基能夠提升氣體分離效果以及增加填料 顆粒與高分子介面的親和力，以避免微結構的缺陷產生。舉例來說， 以NH2-UiO-66 與PIM-1 合成的混合基質薄膜展現了因為官能基與高 分子鍊產生氫鍵，因而加強了在高分子與填料顆粒的介面附著性[1]。 而在本實驗中，我們使用純、胺基以及硝基化的鋯有機金屬框架(UiO- 66)來研究官能基化對Zr-MOF 與聚苯並咪唑(polybenzimidazole, PBI) 的效應，並且以5 ,10, 15 wt%的添加物比例來製備薄膜同時避免合成 時顆粒團聚或沉澱的狀況。除此之外，我們以XRD 鑑定MOF 結構 的結晶性；以SEM 觀察微結構下填料與高分子的包覆與交聯情形； 以熱重分析(TGA)結構的穩定性以及樣品的熱崩解狀態。最後，我們 會將薄膜樣品進行氣體通透的測試，以鑑定薄膜樣品對於氣體的滲透 與選擇能力。;Metal-organic framework (MOF) is a common material used as filler in polymer membranes. Such composite membranes, known as mixed matrix membranes (MMMs) perform better than neat membranes in gas separation applications. Functionalization of MOFs is an important method to improve the fabrication of MMMs. Functional groups enhance the gas separation and interaction between MOF and polymer surface to avoid the formation of defects. For instance, NH2-UiO-66/PIM-1 composite showed interfacial adhesion due to H-bonding interaction at the polymer surface[1] . In this work, we used UiO-66, amino-, and nitro-modified variants to investigate the effect of functional groups between Zr-MOFs and polybenzimidazole (PBI), and we prepared 5, 10 and 15 wt % MOF loading in the polymer in order to investigate agglomeration and sedimentation of particles. Furthermore, XRD characterization was used to determine the crystallinity of the MOF structure; EDS mapping images were used to investigate the dispersion of particles in the matrix; SEM images showed the level of interaction between filler and polymer; TGA analysis indicated the structural stability and the decomposition of the composites. Finally, gas permeation tests demonstrate the gas transport properties and selectivity of the membranes.
