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2008 | 113 | 5 | 1385-1395
Article title

Positron Annilation Lifetime and Glass Transition Temperatures in CO_2 Sorption Polystyrene

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EN
Abstracts
EN
Positron annihilation lifetime spectroscopy was used to measure the free-volume size and distributions as a function of temperature in polystyrene with and without 400 psi CO_2 sorption. The transition temperatures in the polystyrene with CO_2 sorption obtained from ortho-positronium lifetimes were found to depend on the thermal cycles and a meta-stable state showing a negative thermal expansion coefficient was observed between 53°C and 82°C during the first heating up experiment. The observed T_g in polystyrene with, and without CO_2 sorption after annealing from ortho-positronium lifetimes were found to be 86°C and 91°C, which are 5°C higher, and 10°C lower than from the differential scanning calorimetry data, respectively. The observed free-volume variations are discussed in terms of hole expansion, creation, free-volume relaxation, plasticization, and hole filling in amorphous polymers.
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Contributors
author
  • Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110, USA
  • Center of Membrane Technology, Chung-Yuan Christian University, Chung-Li, Taiwan
author
  • Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110, USA
author
  • Department of Chemical and Biomolecular Engineering, Ohio State University, Columbus, OH 43210, USA
author
  • Department of Chemical and Biomolecular Engineering, Ohio State University, Columbus, OH 43210, USA
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Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv113n516kz
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