Poly(ether imide) membranes obtained from solution in cosolvent mixtures

Klaus-Victor Georg Peinemann, J. F. Maggioni, Suzana Nunes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Integral asymmetric membranes for gas separation were prepared by casting a poly(ether imide) solution in tetrahydrofuran (THF) and gamma-butyrolactone (GBL) and coagulating in water. As observed by electron microscopy, very thin selective layers (< 0.5 μm) were obtained with high GBL contents or when butanol was also added to the casting solution, resulting therefore in the highest permeability values (up to 467 1 He/m2 h bar for membranes prepared from casting solutions with 56 wt% GBL). He/N2 selectivity values as a function of solvent composition went through a maximum. Maximum values as high as 131 were obtained with equal amounts of THF and GBL in the solvent mixture. The kinetics and mechanism of membrane formation were investigated by light scattering.

Original languageEnglish (US)
Pages (from-to)3411-3416
Number of pages6
JournalPolymer
Volume39
Issue number15
DOIs
StatePublished - Jan 1 1998

Keywords

  • Nucleation and growth
  • Phase separation
  • Spinodal decomposition

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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