期刊
DESALINATION
卷 217, 期 1-3, 页码 8-16出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2007.01.011
关键词
copolyimides; plasticization; covalent crosslinking; variation of crosslinking conditions; CO2/CH4 pure gas permeation
In membrane based gas separation, crosslinking of membrane materials was shown to be an effective method to stabilize the polymer structure against undesirable plasticization effects. In this study a crosslinkable copolyimide was synthesized by using the dianhydride 6FDA (4,4'-(hexafluoroisopropylidene)diphthalic anhydride) and the diamines ODA (4,4'-oxydianiline), 4MPD (2,3,5,6-tetramethyl-1,4-phenylene diamine) and DABA (3,5-diamino benzoic acid). The last mentioned diamine contains a free carboxylic acid group where crosslinking of the polymer chains is possible by esterfication reaction with a diol. In the current work EG (ethylene glycol) was chosen as crosslinker. The esterfication conditions were varied to optimize the solid-state crosslinking reaction. To investigate the influence of crosslinking conditions on the separation properties of the membranes pure gas permeation experiments were performed with non-crosslinked and the different EG-crosslinked films at 35 degrees C for the gases CO, using feed pressures up to 40 bar and CH4 at pressures up to 10 bar.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据