Journal
POLYMERS
Volume 15, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/polym15173590
Keywords
enthalpy relaxation; dynamic mechanical spectra; creep compliance; polystyrene
Categories
Ask authors/readers for more resources
This paper investigates the impact of annealing time on the specific heat enthalpy of polystyrene above the glass transition temperature. The authors propose an extended model to describe the endothermic overshoot peaks using dynamic mechanical spectra. The study suggests that the enthalpy recovery behavior of glassy polystyrene has a common structural relaxation mode with linear viscoelastic behavior, and the retardation spectra evaluated from the dynamic mechanical spectra can be used as the recovery function of the endothermic overshoot.
This paper studies the effects of annealing time on the specific heat enthalpy of polystyrene above the glass transition temperature. We extend the Tool-Narayanaswamy-Moynihan (TNM) model to describe the endothermic overshoot peaks through the dynamic mechanical spectra. In this work, we accept the viewpoint that the enthalpy recovery behavior of glassy polystyrene (PS) has a common structural relaxation mode with linear viscoelastic behavior. As a consequence, the retardation spectrum evaluated from the dynamic mechanical spectra around the primary Tg peak is used as the recovery function of the endothermic overshoot of specific heat. In addition, the sub-Tg shoulder peak around the Tg peak is found to be related to the structural relaxation estimated from light scattering measurements. The enthalpy recovery of annealed PS is quantitatively described using retardation spectra of the primary Tg, as well as the kinetic process of the sub-Tg relaxation process.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available