Fabrication of polyetherimide microporous membrane using supercritical CO2 technology and its application for affinity membrane matrix

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• 作者：Wenhua Shi ; Gaohong He ; Hongjing Liu ; Jia Ju ; Tonghua Wang ; Xiangcun Li ; Fei Nie
• 关键词：Supercritical CO2 ; Polyetherimide microporous membrane ; BSA adsorption capacity ; Tensile strength ; Pore size distribution
• 刊名：The Journal of Supercritical Fluids
• 出版年：January, 2014
• 年：2014
• 卷：85
• 期：Complete
• 页码：151-158
• 全文大小：3443 K

文摘

Polyetherimide (PEI) microporous membranes with uniform cellular structure, high porosity, and narrow pore size distribution were formed by supercritical CO₂ (ScCO₂) phase inversion method, and the membrane was modified to be a matrix for the preparation of affinity membrane due to its low solvent residue and appropriate porous structure. The effects of ScCO₂ temperature and pressure on the morphology and pure water flux of the membrane were investigated. The membrane prepared at 24 MPa and 45 掳C with a large mean cell diameter of 6.0 渭m, high porosity of 73%, narrow pore size distribution and a pure water flux of 56 L/(m² h bar) was coated with chitosan to improve its hydrophilicity and coupled with Cibacron Blue F3GA (CB) as a special ligand to form an affinity membrane (PEI-coated chitosan-CB membrane). The PEI-coated chitosan-CB membrane showed a high adsorption capacity of 33.9 mg/g membrane to bovine serum albumin and was higher than most of affinity membranes. Moreover, the tensile strength of PEI-coated chitosan-CB membrane was 11.58 MPa and was much higher than those of affinity membranes. This work demonstrates that ScCO₂ phase inversion method is a potential method to prepare an affinity matrix.