Gas separation, free volume distribution, and physical aging of a highly microporous spirobisindane polymer

Chad L. Staiger, Steven J. Pas, Anita J. Hill, Chris J. Cornelius

Research output: Contribution to journalArticle

145 Scopus citations

Abstract

The results from the first direct measurement of the pore size distribution and physical aging of a highly microporous spirobisindane polymer were derived using positron annihilation lifetime spectroscopy (PALS) and the results were compared with high free volume glassy polymers. The spirobisindane polymer shows a high carbon dioxide permeability while a reduction in permeability is observed in glassy polymer with increasing feed pressure of the gas. The spirobisindane polymer is found to have larger small pores and smaller large pores in comparison to PTMSP. The fractional free volume calculated for the spirobisindane polymer is more like the values commonly obtained for polysulfone and polyimide membranes. The PALS results indicate that solvent processing increases the microporosity of the processed spirobisindane polymer from the intrinsic microporosity of its powder.

Original languageEnglish (US)
Pages (from-to)2606-2608
Number of pages3
JournalChemistry of Materials
Volume20
Issue number8
DOIs
StatePublished - Apr 22 2008

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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