Free-volume studies in polyurethane membranes by positron annihilation spectroscopy

M. F. Ferreira Marques, C. Lopes Gil, P. M. Gordo, Z. Kajcsos, A. P. De Lima, D. P. Queiroz, M. N. De Pinho

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The free-volume parameters in various urethane/urea membranes obtained by varying the ratio of the structural constituents, polypropylene oxide and polybutadiene, were studied by positron lifetime and Doppler broadening measurements. On bi-soft segment membranes, a correlation was found between the composition of membranes, the normalized free volume, the radii of the holes and gas permeability. However, the correlation is not clear when PU data are also considered, indicating that other features must also play an important role in the permeation mechanism.

Original languageEnglish
Pages (from-to)573-576
Number of pages4
JournalRadiation Physics and Chemistry
Volume68
Issue number3-4
DOIs
Publication statusPublished - Oct 2003

Fingerprint

positron annihilation
membranes
spectroscopy
polybutadiene
urethanes
ureas
polypropylene
positrons
permeability
life (durability)
radii
oxides
gases

Keywords

  • Free volume
  • Permeability
  • Phase separation
  • Pore size
  • Positronium
  • Urethane/urea polymers

ASJC Scopus subject areas

  • Radiation

Cite this

Ferreira Marques, M. F., Lopes Gil, C., Gordo, P. M., Kajcsos, Z., De Lima, A. P., Queiroz, D. P., & De Pinho, M. N. (2003). Free-volume studies in polyurethane membranes by positron annihilation spectroscopy. Radiation Physics and Chemistry, 68(3-4), 573-576. https://doi.org/10.1016/S0969-806X(03)00234-2

Free-volume studies in polyurethane membranes by positron annihilation spectroscopy. / Ferreira Marques, M. F.; Lopes Gil, C.; Gordo, P. M.; Kajcsos, Z.; De Lima, A. P.; Queiroz, D. P.; De Pinho, M. N.

In: Radiation Physics and Chemistry, Vol. 68, No. 3-4, 10.2003, p. 573-576.

Research output: Contribution to journalArticle

Ferreira Marques, MF, Lopes Gil, C, Gordo, PM, Kajcsos, Z, De Lima, AP, Queiroz, DP & De Pinho, MN 2003, 'Free-volume studies in polyurethane membranes by positron annihilation spectroscopy', Radiation Physics and Chemistry, vol. 68, no. 3-4, pp. 573-576. https://doi.org/10.1016/S0969-806X(03)00234-2
Ferreira Marques, M. F. ; Lopes Gil, C. ; Gordo, P. M. ; Kajcsos, Z. ; De Lima, A. P. ; Queiroz, D. P. ; De Pinho, M. N. / Free-volume studies in polyurethane membranes by positron annihilation spectroscopy. In: Radiation Physics and Chemistry. 2003 ; Vol. 68, No. 3-4. pp. 573-576.
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