Effect of ultraviolet light irradiation on gas permeability in polyimide membranes. 1. Irradiation with low pressure mercury lamp on photosensitive and nonphotosensitive membranes

Shigetoshi Matsui, Takayuki Ishiguro, Akon Higuchi, Tsutomu Nakagawa

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Abstract

Two types of polyimide membranes; one crosslinkable and the other noncrosslinkable using ultraviolet light irradiation (UV irradiation), were prepared and investigated concerning the effect of UV irradiation on their gas permeabilities and selectivities. Permeability and diffusion coefficients for O2, N2, H2, and CO2 were determined using the vacuum pressure and time lag method. Sorption properties for carbon dioxide were carried out to evaluate the changes in the free volume in the membranes due to the irradiation. In both membranes, permeability coefficients for all gases used in this study decreased and permselectivity, particularly for H2 over N2, increased with increasing UV irradiation time without a significant decrease in the flux of H2. The coefficients depended on the membrane thickness, suggesting asymmetrical changes in both membranes due to UV irradiation. It was suggested by an attenuated total reflection (ATR) PTIR method and analysis of the gas sorption properties of the membranes that the physical changes due to UV irradiation at the irradiated side in both membranes significantly affected their gas permeation properties compared with the chemical changes, especially the crosslinking in the crosslinkable type.

Original languageEnglish
Pages (from-to)2259-2269
Number of pages11
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume35
Issue number14
DOIs
StatePublished - Oct 1997

Keywords

  • Crosslinking
  • Gas permeability
  • Physical changes
  • Polyimide membrane
  • Sorption property
  • Ultraviolet light irradiation

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