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Plasticization of polymers with supercritical carbon dioxide: Experimental determination of glass‐transition temperatures

2003; Wiley; Volume: 88; Issue: 9 Linguagem: Inglês

10.1002/app.11881

1097-4628

Paolo Alessi, Angelo Cortesi, Ireneo Kikic, Febe Vecchione,

Adsorption, diffusion, and thermodynamic properties of materials

Abstract High‐pressure partition chromatography, a modification of the inverse gas chromatography technique, is presented as suitable technique for the study of the plasticization effect of carbon dioxide on the following polymers: poly(methyl methacrylate), polystyrene, and bisphenol A–polycarbonate. Polymers in the presence of a compressed gas or a supercritical fluid become plasticized; this means that their glass‐transition temperatures ( T g 's) can be lowered by 10s of degrees, which causes changes in their mechanical and physical properties. CO 2 ‐induced plasticization has an important impact on many polymer processing operations in which the T g depressions of the polymers can be evaluated. The experimental results are discussed and compared with data available from literature for each polymer we considered. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2189–2193, 2003