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2008 | 113 | 5 | 1359-1364
Article title

Free-Volume Studies in Polycaprolactone/Poly(propylene oxide) Urethane/Urea Membranes by Positron Lifetime Spectroscopy

Content
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EN
Abstracts
EN
Positron annihilation lifetime spectroscopy was used to study the free volume parameters in polypropylene oxide-based tri-isocyanate terminated prepolymer/polycaprolactone diol bi-soft urethane/urea membranes (PU/PCL) with PCL content from 5 up to 25 wt%. Positron annihilation lifetime spectroscopy measurements carried out in the temperature range 298-324 K mirrored the phase separation of the various soft and hard segments present in the membranes. The size and amount of free volume holes determined by positron annihilation lifetime spectroscopy appear to be correlated with the CO_2 gas permeability through the membranes.
Keywords
EN
Contributors
  • Department of Chemical Engineering, Instituto Superior de Engenharia, 3031-199 Coimbra, Portugal
  • ICEMS, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal
author
  • ICEMS, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal
author
  • ICEMS, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal
author
  • Department of Chemical Engineering, Instituto Superior Técnico, 1049-001 Lisboa, Portugal
  • Department of Chemical Engineering, Instituto Superior Técnico, 1049-001 Lisboa, Portugal
author
  • KFKI Research Institute for Particle and Nuclear Physics, P.O.B. 49, 1525 Budapest, Hungary
author
  • KFKI Research Institute for Particle and Nuclear Physics, P.O.B. 49, 1525 Budapest, Hungary
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv113n512kz
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