Organic-inorganic membranes prepared from polyether diamine and epoxy silane

M. L. Sforça, I. V P Yoshida, S. P. Nunes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Scopus citations


Organic-inorganic polymer membranes were prepared by reacting 3-glycidoxypropyl trimethoxysilane with diamines containing polyether segments, followed by hydrolysis and condensation with acid catalysis. The films were characterized by nuclear magnetic resonance and by dynamic mechanical analysis. The rigidity of the films increased with increasing epoxy content and also with addition of tetraethoxy silane (TEOS) to the reacting medium. Water absorption experiments showed that the diffusivity is decreased with increasing TEOS content. Membranes were evaluated for nanofiltration giving cut offs down to 860g/mol (with a water flux of 2.5l/hm2bar). For gas separation, CO2/N2 selectivity values up to 89 were obtained with CO2 permeability of 125Barrer. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)197-207
Number of pages11
JournalJournal of Membrane Science
Issue number1-2
StatePublished - Jul 1 1999
Externally publishedYes


  • Epoxy silane
  • Organic-inorganic membranes
  • Polyether diamine

ASJC Scopus subject areas

  • Filtration and Separation
  • Polymers and Plastics


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