Gas permeability and temperature-dependent free-volume studies in polyurethane membranes by positron lifetime and doppler spectroscopies

M. F Ferreira Marques, P. M. Gordo, C. Lopes Gil, A. P. De Lima, D. Placco Queiroz, M. Norberta De Pinho, Z. Kajcsos, G. Duplâtre

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Positron annihilation lifetime and Doppler broadening spectroscopies were used to study the free volume parameters in polypropylene oxide/polybutadiene bi-soft segment urea/urethane membranes (PU/PBDO), with PBDO content varying from 0 up to 75 wt % in the temperature range 298-324 K. The gas permeation features appear to be correlated with the free volume sizes determined by the lifetime measurements whereas phase separation of the various soft and hard segments in the membranes is mirrored by both the lifetime and Doppler results.

Original languageEnglish
Pages (from-to)289-291
Number of pages3
JournalMaterials Science Forum
Volume445-446
Publication statusPublished - 2004

Fingerprint

Gas permeability
Polyurethanes
Free volume
Positrons
positrons
permeability
Spectroscopy
membranes
Membranes
Polypropylene oxides
life (durability)
Positron annihilation
Polybutadienes
Urethane
Doppler effect
gases
Permeation
Urea
Phase separation
spectroscopy

Keywords

  • Doppler-Broadening
  • Free Volume
  • Polyurethanes
  • Positron Lifetime

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Marques, M. F. F., Gordo, P. M., Gil, C. L., De Lima, A. P., Queiroz, D. P., De Pinho, M. N., ... Duplâtre, G. (2004). Gas permeability and temperature-dependent free-volume studies in polyurethane membranes by positron lifetime and doppler spectroscopies. Materials Science Forum, 445-446, 289-291.

Gas permeability and temperature-dependent free-volume studies in polyurethane membranes by positron lifetime and doppler spectroscopies. / Marques, M. F Ferreira; Gordo, P. M.; Gil, C. Lopes; De Lima, A. P.; Queiroz, D. Placco; De Pinho, M. Norberta; Kajcsos, Z.; Duplâtre, G.

In: Materials Science Forum, Vol. 445-446, 2004, p. 289-291.

Research output: Contribution to journalArticle

Marques, MFF, Gordo, PM, Gil, CL, De Lima, AP, Queiroz, DP, De Pinho, MN, Kajcsos, Z & Duplâtre, G 2004, 'Gas permeability and temperature-dependent free-volume studies in polyurethane membranes by positron lifetime and doppler spectroscopies', Materials Science Forum, vol. 445-446, pp. 289-291.
Marques, M. F Ferreira ; Gordo, P. M. ; Gil, C. Lopes ; De Lima, A. P. ; Queiroz, D. Placco ; De Pinho, M. Norberta ; Kajcsos, Z. ; Duplâtre, G. / Gas permeability and temperature-dependent free-volume studies in polyurethane membranes by positron lifetime and doppler spectroscopies. In: Materials Science Forum. 2004 ; Vol. 445-446. pp. 289-291.
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AU - De Lima, A. P.

AU - Queiroz, D. Placco

AU - De Pinho, M. Norberta

AU - Kajcsos, Z.

AU - Duplâtre, G.

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