Equilibrium swelling measurements of network and semicrystalline polymers in supercritical carbon dioxide using high-pressure NMR

Thurecht, K. J., Hill, D. J. T. and Whittaker, A. K. (2005) Equilibrium swelling measurements of network and semicrystalline polymers in supercritical carbon dioxide using high-pressure NMR. Macromolecules, 38 9: 3731-3737. doi:10.1021/ma0503108


Author Thurecht, K. J.
Hill, D. J. T.
Whittaker, A. K.
Title Equilibrium swelling measurements of network and semicrystalline polymers in supercritical carbon dioxide using high-pressure NMR
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
Publication date 2005
Sub-type Article (original research)
DOI 10.1021/ma0503108
Volume 38
Issue 9
Start page 3731
End page 3737
Total pages 7
Editor T. P. Lodge
Place of publication Washington
Publisher American Chemical Society
Collection year 2005
Language eng
Subject C1
250504 Polymerisation Mechanisms
680303 Polymeric materials (e.g. paints)
Abstract The extent of swelling of cross-linked poly(dimethylsiloxane) and linear low-density poly(ethylene) in supercritical CO2 has been investigated using high-pressure NMR spectroscopy and microscopy. Poly(dimethylsiloxane) was cross-linked to four different cross-link densities and swollen in supercritical CO2. The Flory-Huggins interaction parameter, x, was found to be 0.62 at 300 bar and 45 degrees C, indicating that supercritical CO2 is a relatively poor solvent compared to toluene or benzene. Linear low-density poly(ethylene) was shown to exhibit negligible swelling upon exposure to supercritical CO2 up to 300 bar. The effect Of CO2 pressure on the amorphous region of the poly(ethylene) was investigated by observing changes in the H-1 T-2 relaxation times of the polymer. These relaxation times decreased with increasing pressure, which was attributed to a decrease in mobility of the polymer chains as a result of compressive pressure.
Keyword Polymer Science
Nuclear-magnetic-resonance
Cross-linking
Poly(dimethylsiloxane) Networks
Interaction Parameter
Radiation-chemistry
Natural-rubber
Polyethylene
Relaxation
Sorption
Diffusion
Q-Index Code C1

 
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