接枝型聚离子液体聚砜膜制备及CO2分离性能 （着急）

Synthesis and Performance of Grafted Polymerized Ionic Liquids Polysulfone Membrane for CO2 Separation

摘要:

聚离子液体是一种具有较高CO2选择性的新型膜材料，然而，由于可聚合离子液体的种类少、价格昂贵，难以实现工业应用。对此，本文提出以商业化芳族聚合物聚砜（PSf）为基础材料，通过简单可控的氯甲基化和咪唑鎓化反应，制备接枝型聚离子液体—咪唑鎓化聚砜（PSf-g-[MIm][Cl]）膜。研究了咪唑鎓化程度、操作温度、操作压力对膜性能的影响，结果表明该膜材料具有较好的压力稳定性，并且咪唑鎓（MIm）基团含量会极大的影响其性能，随着咪唑鎓化程度的增加，膜内MIm基团逐渐形成连续的传递通道，CO2渗透系数和选择性显著提高。本文制备的聚离子液体，咪唑鎓化程度最高达172%，具有良好的成膜性，在25 ℃、0.4 MPa以及增湿条件下进行测试，CO2渗透系数达到66.4 barrer，CO2/N2选择性为118.4。

Abstract:

Polymerized ionic liquids(PILs) are novel membrane materials with good CO2/N2 perm-selectivity. However, the industrial application of PILs is restricted by infrequent and expensive polymerizable ionic liquids. In this work, imidazolium-functionalized polysulfones (PSf-g-[MIm][Cl]) were synthesized by simple and controllable chloromethylation-Menshutkin two-step method. The effects of degree of Imidazolium (DIm), test temperature and pressure on the performance of the membrane were investigated. The results show that the membrane has a better pressure stability and the content of MIm is a critical factor on CO2 separation performance. As the content of MIm increases, CO2 permeability and CO2/N2 perm-selectivity improve obviously, attributing to the formation of continuous channel. Moreover, PSf-g-[MIm][Cl] shows excellent film forming ability even with a degree of imidazolium up to 172%, at 25 ℃, 0.4 MPa and humid conditions, the membrane shows good CO2 permeability of 66.4 barrer and CO2/N2 perm-selectivity of 118.4.