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, Zs Kajcsos, G. Duplâtre

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationPositron Annihilation
Subtitle of host publicationProceedings of the 13th International Conference on Positron Annihilation, ICPA-13
EditorsToshio Hyodo, Haruo Saito, Yoshinori Kobayashi, Yasuyuki Nagashima
PublisherTrans Tech Publications Ltd
Pages289-291
Number of pages3
ISBN (Print)9780878499366
Publication statusPublished - Jan 1 2004
EventPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13 - Kyoto, Japan
Duration: Sep 7 2003Sep 12 2003

Publication series

NameMaterials Science Forum
Volume445-446
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

ConferencePositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13
CountryJapan
CityKyoto
Period9/7/039/12/03

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Marques, M. F. F., Gordo, P. M., Gil, C. L., De Lima, A. P., Queiroz, D. P., De Pinho, M. N., Kajcsos, Z., & Duplâtre, G. (2004). Gas permeability and temperature-dependent free-volume studies in polyurethane membranes by positron lifetime and doppler spectroscopies. In T. Hyodo, H. Saito, Y. Kobayashi, & Y. Nagashima (Eds.), Positron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13 (pp. 289-291). (Materials Science Forum; Vol. 445-446). Trans Tech Publications Ltd.