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• W2793804529 abstract "Atactic polystyrene, as reported in a recent contribution by our group, displays a marked change in glass transition when exposed to toluene vapor due to plasticization associated with vapor sorption within the polymer. The dependence of the glass transition temperature of the polymer–penetrant mixture on the pressure of toluene vapor is characterized by the so-called “retrograde vitrification” phenomenon, in that, at a constant pressure, a rubber to glass transition occurs by increasing the temperature. In this contribution, we have used a theoretical approach, based on the nonrandom lattice fluid thermodynamic model for the polymer–toluene mixture, to predict the state of this system, i.e., rubbery or glassy, as a function of fluid pressure and system temperature. The experimentally detectable glass transition is assumed to be a kinetically affected evidence of an underlying II order thermodynamic transition of the polymer mixture. On the basis of this hypothesis, the Gibbs–Di Marzio criterion, stating that equilibrium configurational entropy is zeroed at the glass transition, has been applied to locate the transition. The working set of equations consists of the expression of configurational entropy obtained from the adopted lattice fluid model equated to zero, coupled with the equation expressing the phase equilibrium between the polymer phase and the pure toluene vapor phase in contact and with the equations of state for the two phases. Theoretical predictions are in good qualitative and quantitative agreement with the experimental results previously obtained gravimetrically performing “dynamic” sorption experiments, which represent a neat example of the occurrence of so-called “type IV” glass transition temperature vs pressure behavior. The peculiar retrograde vitrification phenomenon and the glass transition temperature vs pressure envelope determined experimentally are well described by the proposed theoretical approach." @default.
• W2793804529 created "2018-03-29" @default.
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• W2793804529 date "2018-03-02" @default.
• W2793804529 modified "2023-09-24" @default.
• W2793804529 title "Modeling Retrograde Vitrification in the Polystyrene–Toluene System" @default.
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• W2793804529 doi "https://doi.org/10.1021/acs.jpcb.8b01766" @default.
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