Abstract
AbstractMeasurements of preferential adsorption, λ(ν), by differential refractometry, and of swelling equilibrium, ν3−, of polydimethylsiloxane (PDMS) networks were carried out in the solvent mixture ethyl methyl ketone (MEK) + cyclohexane (Ch), at 25°C. The preferential adsorption and the total sorption were also determined, by light scattering, for linear PDMS in the same mixed solvent. The behaviour of the system crosslinked PDMS/MEK + Ch is compared with that of the system linear PDMS (dilute solution)/MEK + Ch. The experimental values of ν3 and λ are compared with those predicted by thermodynamic theory. For this comparison, new thermodynamic equations, to calculate preferential and total sorption at finite polymer concentration, are derived using the extended Flory‐Huggins model. The derived equations take into account the solvent composition dependence of interaction parameters, neglected (as an approximation) in previous works.
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