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Title: Free Volume Expansion of Poly[1-(trimethylsilyl)-1-propyne] Treated in Supercritical Carbon Dioxide As Revealed by Positron Annihilation Lifetime Spectroscopy
Authors: CLAES, Stan
Vandezande, Pieter
Mullens, Steven
VAN BAEL, Marlies
Maurer, Frank H. J.
Issue Date: 2011
Citation: 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 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.
Notes: [Claes, Stan; Vandezande, Pieter; Mullens, Steven] Flemish Inst Technol Res VITO, B-2400 Mol, Belgium. [Claes, Stan; Van Bael, Marlies K.] Hasselt Univ, Lab Inorgan & Phys Chem, Inst Mat Res, B-3590 Diepenbeek, Belgium. [Van Bael, Marlies K.] IMEC VZW, Div IMOMEC, B-3590 Diepenbeek, Belgium. [Maurer, Frans H. J.] Lund Univ, Dept Chem, SE-22100 Lund, Sweden. stan.claes@vito.be; frans.maurer@polymat.lth.se
URI: http://hdl.handle.net/1942/11935
DOI: 10.1021/ma1029345
ISI #: 000289593200046
ISSN: 0024-9297
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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