Abstract
Despite the general knowledge that near-critical and supercritical CO 2 will swell elastomers extensively, there has been little work done to date on modelling the phenomenon. We have used the mean-field-lattice-gas model of Kleintjens et al. for the free energy of mixing with an additional elastic term due to Flory, in order to model the swelling of crosslinked silicones by supercritical CO 2. Whereas the model reproduces the pressure trends in both volume change and weight fraction fluid absorbed well for the poly(dimethylsiloxane)—CO 2 system, the absolute predictions of weight fraction CO 2 absorbed are too high in the vicinity of critical pressure.
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