Gas transport properties of 6FDA-durene/1,3-phenylenediamine (mPDA) copolyimides

Tai-Shung Chung*, Wen Hui Lin, Rohit H. Vora

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The gas transport properties of He, H2, O2, N2, and Co2 for 6FDA-durene, 6FDA-mPDA, and their copolyimides have been investigated as a function of the composition, pressure, and temperature. The permeabilities, diffusion coefficients, and solubility coefficients follow the simple additional rules and Arrhenius relationships for 6FDA-durene/mPDA polyimides. The permeability decreases with an increase in pressure except He, and in the kinetic diameters of the penetrant molecules with the order of He, Co2, O2, and N2. The diffusion coefficients of O2, N2, and CO2 increase with increasing pressure and temperature. Interestingly, for these polyimides, the diffusion coefficient of O2 is larger than that of CO2. This may be caused by the strong quadrupole moment of the CO2 molecules or the difficulty in estimating the accurate diameter of CO2 molecules. The solubility coefficients decrease in the order of inherent condensability of the penetrant gases, namely CO2, O2, and N2. In addition, WAXD results show that 6FDA-durene/mPDA polyimides are amorphous. The presence of a single glass transition temperature for these copolyimides indicates that these polyimides can be assumed to be random copolymers. They have excellent thermal stability exhibiting degradation temperature in a range of 493 to 548°C.

Original languageEnglish (US)
Pages (from-to)3552-3564
Number of pages13
JournalJournal of Applied Polymer Science
Volume81
Issue number14
DOIs
StatePublished - Sep 29 2001

Keywords

  • 6FDA-based polyimide
  • Copolyimides
  • Fluoro-polyimides
  • Gas transport properties
  • Permeability

ASJC Scopus subject areas

  • Polymers and Plastics

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