Synthesis and characterization of poly (ethylene oxide) containing copolyimides for hydrogen purification

Hangzheng Chen, Youchang Xiao, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Reverse selective membranes comprising poly(ethylene oxide) (PEO) containing copolyimides (PEO-PI) with variations of acid dianhydrides and diamines have been synthesized for hydrogen purification. The reverse selectivity of the membranes decimate the energy required for hydrogen recompression process. Factors including PEO content, PEO molecular weight, and fractional free volume (FFV) that would affect the gas transport performance have been investigated and elucidated in terms of degree of crystallinity, phase separation in the PEO domain as well as inter-penetration between the hard and soft segments. In mixed gas tests of CO2 and H2 mixtures, a highly condensable CO2 out compete H2 for the sorption sites in hard segment and diminishes H2 permeability. Thus the CO2/H2 selectivity in the mixed gas tests is much higher than that in pure gas tests. Mixed gas permeation tests at 35 °C and 2atm show that the best reverse selective membranes have a CO2 permeability of 179.3 Barrers and a CO2/H2 permselectivity of 22.7. The physical properties of PEO-PIs have also been characterized by FTIR, DSC, GPC, WAXS, AFM and tensile strain tests.

Original languageEnglish (US)
Pages (from-to)4077-4086
Number of pages10
JournalPolymer
Volume51
Issue number18
DOIs
StatePublished - Jan 1 2010

Keywords

  • Hydrogen purification
  • PEO containing copolyimide(PEO-PI)
  • Poly(ethylene oxide) PEO

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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