The Dynamics of the Glass Transition in a Semicrystalline PET Studied by Mechanical and Dielectric Spectroscopic Methods

摘要

The conformational chain mobility of a semicrystalline poly(ethylene terephthalate), PET, is studied in the glass transition region by different techniques: Thermally Stimulated Recovery (TSR) in the tensile mode using both global and thermal sampling experiments, Dynamic Mechanical Analysis (DMA) and dielectric relaxation spectroscopy. The viscoelastic response observed above T_g in the mechanical results is attributed to the manifestation of irreversible viscous flow.