Free Volume Expansion of Poly[1-(trimethylsilyl)-1-propyne] Treated in Supercritical Carbon Dioxide As Revealed by Positron Annihilation Lifetime Spectroscopy
(2011) In Macromolecules 44(8). p.2766-2772- Abstract
- The free volume changes of poly[1-(trimethyl-silyl)-1-propyne] (PTMSP) treated in supercritical CO2 (scCO(2)) were investigated with positron annihilation lifetime spectroscopy (PALS). CO2 is known to plasticize and increase the free volume size of a broad range of polymers. In this work dense PTMSP films were treated with scCO(2) under different pressures and temperatures, resulting in the enlargement of the characteristic channel-like holes (R-3) and the larger free volume cages (R-4) up to 39% and 19%, respectively. The free volume enlargement was found to have a relaxation time of similar to 30 years. At higher temperatures (110-150 degrees C), the o-Ps intensities and gel permeation chromatography (GPC) data revealed chemical changes... (More)
- The free volume changes of poly[1-(trimethyl-silyl)-1-propyne] (PTMSP) treated in supercritical CO2 (scCO(2)) were investigated with positron annihilation lifetime spectroscopy (PALS). CO2 is known to plasticize and increase the free volume size of a broad range of polymers. In this work dense PTMSP films were treated with scCO(2) under different pressures and temperatures, resulting in the enlargement of the characteristic channel-like holes (R-3) and the larger free volume cages (R-4) up to 39% and 19%, respectively. The free volume enlargement was found to have a relaxation time of similar to 30 years. At higher temperatures (110-150 degrees C), the o-Ps intensities and gel permeation chromatography (GPC) data revealed chemical changes of the scCO(2)-treated polymer due to the onset of PTMSP's degradation. However, at lower temperatures (40-70 degrees C), significant free volume cavity size increases to 25% for R-3 and 9% for R-4 were also observed. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1964896
- author
- Claes, Stan ; Vandezande, Pieter ; Mullens, Steven ; Van Bael, Marlies K. and Maurer, Frans LU
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Macromolecules
- volume
- 44
- issue
- 8
- pages
- 2766 - 2772
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000289593200046
- scopus:79955034762
- ISSN
- 0024-9297
- DOI
- 10.1021/ma1029345
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
- id
- 00653059-fa0a-4cd4-9dd3-46d5b37ae145 (old id 1964896)
- date added to LUP
- 2016-04-01 10:17:26
- date last changed
- 2022-02-17 08:38:34
@article{00653059-fa0a-4cd4-9dd3-46d5b37ae145, abstract = {{The free volume changes of poly[1-(trimethyl-silyl)-1-propyne] (PTMSP) treated in supercritical CO2 (scCO(2)) were investigated with positron annihilation lifetime spectroscopy (PALS). CO2 is known to plasticize and increase the free volume size of a broad range of polymers. In this work dense PTMSP films were treated with scCO(2) under different pressures and temperatures, resulting in the enlargement of the characteristic channel-like holes (R-3) and the larger free volume cages (R-4) up to 39% and 19%, respectively. The free volume enlargement was found to have a relaxation time of similar to 30 years. At higher temperatures (110-150 degrees C), the o-Ps intensities and gel permeation chromatography (GPC) data revealed chemical changes of the scCO(2)-treated polymer due to the onset of PTMSP's degradation. However, at lower temperatures (40-70 degrees C), significant free volume cavity size increases to 25% for R-3 and 9% for R-4 were also observed.}}, author = {{Claes, Stan and Vandezande, Pieter and Mullens, Steven and Van Bael, Marlies K. and Maurer, Frans}}, issn = {{0024-9297}}, language = {{eng}}, number = {{8}}, pages = {{2766--2772}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Macromolecules}}, title = {{Free Volume Expansion of Poly[1-(trimethylsilyl)-1-propyne] Treated in Supercritical Carbon Dioxide As Revealed by Positron Annihilation Lifetime Spectroscopy}}, url = {{http://dx.doi.org/10.1021/ma1029345}}, doi = {{10.1021/ma1029345}}, volume = {{44}}, year = {{2011}}, }