Novel highly permselective 6F-poly(amide-imide)s as membrane host for nano-sized catalysts

D. Fritsch*, K. V. Peinemann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Scopus citations


Poly(amide-imide)s (PAIs) combine properties of amide and imide polymers. On a synthetic route starting with preformed imide monomers (as dicarboxylic acids) and diamines, PAIs are readily available in various structures and different properties. Hexafluoroisopropylidene (6F) units are element of the dicarboxylic acid or diamine part or both parts of the PAI. Tailoring of the polymer was achieved to high permselectivities and ability to generate nano-sized noble metal catalysts in high amounts, > 20 wt% noble metal, inside the polymer membranes. Even at high catalyst loading, the films remained flexible. Gas permeabilities up to 15 barrer for O2 ( pO2 pN2 = 5.4) and 100 barrer for H2 ( pH2 pN2 = 35) and selectivities up to 7.6 for pO2 pN2 (pO2 = 1.8 barrer) and 100 for pH2 pN2 (pH2 = 23 barrer) were measured. Gas permeability and selectivity data of CH4, N2, O2, He, H2 and CO2 are reported. In addition, various salts in amounts up to 50 wt% were incorporated into the films and chemically transformed to catalysts. These catalysts generated inside the membrane were homogeneously distributed, still active and homogeneous in size (∼ 2 nm). The influence of salts and catalysts on the gas permeation properties of these nonporous membranes is discussed and their catalytic activity is shown by hydrogen sorption. Thin film composite membranes on PVDF supports with and without catalyst were prepared and their permselectivity data are reported.

Original languageEnglish (US)
Pages (from-to)29-38
Number of pages10
JournalJournal of Membrane Science
Issue number1
StatePublished - Feb 14 1995
Externally publishedYes


  • Gas permeability
  • Nano-sized catalyst
  • Poly(amide imide)

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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