Cross-linked polyimide membranes for solvent resistant nanofiltration in aprotic solvents

✍ Scribed by Katrien Vanherck; Pieter Vandezande; Steliana O. Aldea; Ivo F.J. Vankelecom

• Book ID: 104054823
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 654 KB
• Volume: 320
• Category: Article
• ISSN: 0376-7388
• DOI: 10.1016/j.memsci.2008.04.026

✦ Synopsis

Solvent stable nanofiltration membranes were prepared through the chemical cross-linking of asymmetric Matrimid ® -based polyimide membranes with p-xylylenediamine. The influence of this straightforward post-treatment on membrane stability, morphology and performance in dimethylformamide (DMF), Nmethylpyrrolidinone (NMP), dimethylacetamide (DMAc) and dimethylsulfoxide (DMSO) was thoroughly investigated. With permeabilities up to 5.4 l/m 2 bar h and rejections up to 98% for low molecular weight dyes in these demanding solvents, optimally performing, truly solvent resistant nanofiltration membranes were obtained. Nanozeolite-filled membranes were prepared in parallel to study the effect of an inorganic filler on the cross-linking reaction and performance in aprotic solvents. The outstanding stability and performance of these membranes and their easy preparation clearly offer vast potential for applications in harsh solvent environments.