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

Andersson, Anna LU ; Zhai, Wentao; Yu, Jian; He, Jiasong and Maurer, Frans LU (2010) In Polymer 51(1). p.146-152
Abstract
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,... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Positron annihilation, Supercritical fluids, Temperature modulated DSC
in
Polymer
volume
51
issue
1
pages
146 - 152
publisher
Elsevier
external identifiers
  • wos:000273439500019
  • scopus:72549120084
ISSN
0032-3861
DOI
10.1016/j.polymer.2009.11.019
language
English
LU publication?
yes
id
9578c2cd-0dca-43c5-a9e1-e489abe707d5 (old id 1547759)
date added to LUP
2010-02-23 13:21:39
date last changed
2018-05-29 09:45:27
@article{9578c2cd-0dca-43c5-a9e1-e489abe707d5,
  abstract     = {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.},
  author       = {Andersson, Anna and Zhai, Wentao and Yu, Jian and He, Jiasong and Maurer, Frans},
  issn         = {0032-3861},
  keyword      = {Positron annihilation,Supercritical fluids,Temperature modulated DSC},
  language     = {eng},
  number       = {1},
  pages        = {146--152},
  publisher    = {Elsevier},
  series       = {Polymer},
  title        = {Free volume and crystallinity of poly(ethylene naphthalate) treated in pressurized carbon dioxide},
  url          = {http://dx.doi.org/10.1016/j.polymer.2009.11.019},
  volume       = {51},
  year         = {2010},
}