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In this paper we model the volumetric and enthalpic response of a-PMMA during heating at constant rate through the glass transition region following an aging period of varying length. The modeling is based on a recently developed thermodynamically consistent non-linear viscoelastic theory of thermal and mechanical behaviors of glassy polymers in the glass transition range [Caruthers JM, Adolf DB,...
This paper presents the results of measurements of physical aging on polystyrene with a narrow molecular weight distribution (M w /M n =1.03). The evolution of the aging process was followed by recording the relaxed enthalpy and the accompanying decrease in volume, using differential scanning calorimetry and mercury-in-glass dilatometry, respectively. The measurements were carried...
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