Preparation of porous PEI membranes using supercritical CO2 phase inversion method
A series of microporous Polyetherimide (PEI) membranes were prepared using supercritical carbon dioxide (SC-CO2) phase inversion method with SC-CO2 as non-solvent. The membrane formation pressures were varied between 10 and 20MPa and temperatures between 35 and 70 ℃ for the PEI/NMP membrane casting solution with the concentration of 19％ or 20％. The structure of the obtained membranes was analysed using scanning electron microscopy (SEM) and the porosity was calculated by the density ratio of the obtained membrane and the PEI homogeneous membrane. It was indicated that porosity and the cell size increased and membrane structure changed from asymmetry to symmetry with the increasing pressure; porosity firstly decreased without the skin layer and then increases with the layer, when temperature increased. Without the layer, the phase separation process was instantaneous demixing; with the layer, it was called slow demixing. The experimental results showed that SC-CO2 phase inversion method could easily modulate the membrane morphology by simply changing the operating conditions and the method might be a promising technique to prepare novel porous PEI membrane.
Supercritical carbon dioxide PEI Porous membrane Phase inversion
Wenhua Shi Gaohong He Dan Liu Shuang Gu Lin Peng
State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, Dalian University of Technology, 158 Zhongshan Road, Dalian, PC 116012, China
国际会议
The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)
北京
英文
2007-10-14（万方平台首次上网日期，不代表论文的发表时间）