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Free volume and crystallinity of poly(ethylene naphthalate) treated in pressurized carbon dioxide

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Author

  • Anna Andersson
  • Wentao Zhai
  • Jian Yu
  • Jiasong He
  • Frans Maurer

Summary, in English

The free volume and crystallization behaviour of poly(ethylene naphthalate) (PEN) treated in pressurized carbon dioxide was studied, using Positron Annihilation Lifetime Spectroscopy (PALS) and Differential Scanning Calorimetry (DSC). PALS probes the values of free volume cavity sizes in materials, thus making it possible to investigate the effect of pressurized carbon dioxide treatment on free volume hole sizes in PEN. The crystallinity and melting behaviour of PEN was analyzed with temperature modulated DSC. We found that the carbon dioxide pressure during treatment of PEN was the prime parameter affecting the value of free volume after the treatment. The free volume sizes were observed to be insensitive to the other two parameters, temperature and time. Increasing the time of the treatment however, increased the crystallinity of PEN. Interestingly, this was not coupled to a decrease in ortho-Positronium intensity as was expected, indicating that positronium may form in the crystalline fraction of the polymer as well as in the amorphous fraction. (C) 2009 Elsevier Ltd. All rights reserved.

Publishing year

2010

Language

English

Pages

146-152

Publication/Series

Polymer

Volume

51

Issue

1

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Sciences

Keywords

  • Positron annihilation
  • Supercritical fluids
  • Temperature modulated DSC

Status

Published

ISBN/ISSN/Other

  • ISSN: 0032-3861