膜
微型多孔材料
材料科学
聚酰亚胺
化学工程
聚合物
聚酰胺
高分子化学
溶解度
混溶性
气体分离
有机化学
复合材料
化学
图层(电子)
生物化学
工程类
作者
Jiaqi Li,Weilin Feng,Mengxiao Zhang,Xiaohe Wang,Chuanjie Fang,Yunlong Wang,Lin Zhang,Liping Zhu
标识
DOI:10.1002/marc.202200826
摘要
Abstract Polymers of intrinsic microporosity (PIMs) are a class of microporous organic materials that contain interconnected pores of less than 2 nm in diameter. Such materials are of great potential used in membranes for molecular separation, such as drug fractionation in pharmaceutical industry. However, the PIMs membranes are often susceptible to low separation selectivity toward different molecules due to their wide pore size distribution. Herein, a linear polyimide, Matrimid, is incorporated with PIM‐1 (a typical member of PIMs) by solution blending, and the blends are dip‐coated onto a polyimide P84 support membrane to prepare thin‐film composite (TFC) membranes to control pore size distribution while keep high microporosity. The component miscibility, pore characteristics, and molecular separation performances of the Matrimid/PIM‐1 TFC membranes are investigated in detail. The Matrimid and PIM‐1 are partially miscible due to their similar Hansen solubility parameters. The Matrimid endows the selective layers (coatings) with narrower pore size distribution due to more compact chain packing. The prepared Matrimid/PIM‐1 TFC membranes show high selectivity for separation of riboflavin (80% of retention) and isatin (only 5% of retention). The developed membranes exhibit great potential for separating molecules with different molecular weights.
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