The swelling behavior of molten poly(epsilon-caprolactone) in contact with carbon dioxide has been analyzed by using the pendant drop method. At subcritical pressures, the swelling kinetics of the polymer-gas solution follow the typical Fickian diffusion behavior, the volume approaching an equilibrium value after the initial transient. In supercritical conditions, after the first transient, the volume of the solution does not approach an equilibrium value but still, slowly increases. Raman experiments have suggested that this anomalous time-dependent swelling in scCO2 could be due or to slow, secondary diffusion, or to polymer dissolution in scCO2.
Anomalous Swelling of Molten PCL/scCO(2) solutions / Pastore Carbone, M. G.; Tammaro, D.; De Maio, A.; DI MAIO, Ernesto; Hankel, R.; Braeuer, A.; Mensitieri, Giuseppe. - 1599:(2014), pp. 230-233. (Intervento presentato al convegno TIMES OF POLYMERS (TOP) AND COMPOSITES 2014 tenutosi a Ischia (Na) nel 22-26 giugno 2014) [10.1063/1.4876820].
Anomalous Swelling of Molten PCL/scCO(2) solutions
D. Tammaro;DI MAIO, ERNESTO;MENSITIERI, GIUSEPPE
2014
Abstract
The swelling behavior of molten poly(epsilon-caprolactone) in contact with carbon dioxide has been analyzed by using the pendant drop method. At subcritical pressures, the swelling kinetics of the polymer-gas solution follow the typical Fickian diffusion behavior, the volume approaching an equilibrium value after the initial transient. In supercritical conditions, after the first transient, the volume of the solution does not approach an equilibrium value but still, slowly increases. Raman experiments have suggested that this anomalous time-dependent swelling in scCO2 could be due or to slow, secondary diffusion, or to polymer dissolution in scCO2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
