Acetone influence on glass transition of poly(methyl methacrylate) and polystyrene in compressed carbon dioxide / Jun He in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009)  

Acetone influence on glass transition of poly(methyl methacrylate) and polystyrene in compressed carbon dioxide [texte imprimé] / Jun He, Auteur ; Bo Wang, Auteur . - 2009 . - pp. 5093–5097.
Chemical engineering
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 5093–5097

Mots-clés :	Poly(methyl methacrylate) Polystyrene Compressed gaseous acetone/carbon dioxide Glass transition pressure
Résumé :	In this work, the glass transitions of poly(methyl methacrylate) and polystyrene in compressed gaseous acetone/carbon dioxide were measured by an in situ creep compliance method at pressures lower than 7.0 MPa and at 318−338 K. When a small amount of acetone (x = 0.01−0.02) was added to a polymer-compressed carbon dioxide system, the glass transition pressure of polymer was further depressed by 1.0−4.0 MPa. The observed glass transition pressure depression increased with the acetone concentration in carbon dioxide and decreased with the temperature rise. A simple model was used to estimate the glass transition temperature depressions for the polymers in compressed gaseous acetone/carbon dioxide solution. The calculated results were in good agreement with the determined ones, except for the retrograde vitrification region.
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie801949g