Gas permeation and positron annihilation lifetime spectroscopy of poly(ether imides) containing main chain ethylene oxide segments

Richard A. Pethrick, Fernan Santamaria-Mendia

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This article reports a study of four poly(ether imide)s with varying ethylene oxide (EO) segments lengths using positron annihilation lifetimes spectroscopy, wide angle X-ray diffraction, and gas transport measurements. The measured properties change with the length of the EO segment. Comparison of the poly(ether imide) containing a single ether linkage with those containing one and three EO units, show progressive changes of the permeability and diffusion coefficient with void size. However, when six EO units are incorporated into the polymer backbone certain of the observed trends are reversed. Incorporation of flexible EO segments in the polymer backbone allows changes in the chain-chain interactions which increases the packing density and changes the void size and influences the solubility coefficients leading to variation of the gas transport characteristics. Differences in the measured solubility parameters reflect the extent to which the gases molecules are able to interact with the polymer matrix. The highest values obtained for the gas separation for carbon dioxide and nitrogen is observed when EO has a value of three. Further increasing of the length of the EO segments in the poly(ether imide) leads to a reduction the gas transport properties and hence the extent to which gas separation would be achieved.

LanguageEnglish
Pages1654-1662
Number of pages9
JournalJournal of Polymer Science Part B: Polymer Physics
Volume53
Issue number23
Early online date16 Jul 2015
DOIs
Publication statusPublished - 1 Dec 2015

Fingerprint

Imides
Ethylene Oxide
Positron annihilation
imides
ethylene oxide
positron annihilation
Permeation
Ether
Ethers
ethers
Ethylene
Gases
Spectroscopy
life (durability)
Oxides
gas transport
gases
spectroscopy
voids
Polymers

Keywords

  • diffusivity
  • permeability
  • poly(ether imide)
  • positron annihilation lifetime spectroscopy
  • solubility coefficient
  • wide angel X-ray diffraction

Cite this

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Gas permeation and positron annihilation lifetime spectroscopy of poly(ether imides) containing main chain ethylene oxide segments. / Pethrick, Richard A.; Santamaria-Mendia, Fernan.

In: Journal of Polymer Science Part B: Polymer Physics, Vol. 53, No. 23, 01.12.2015, p. 1654-1662.

Research output: Contribution to journalArticle

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