Abstract
A comparative study of amorphous, uniaxially and biaxially oriented films has been performed by thermally stimulated current (TSC) spectroscopy. The study of the TSC peak observed around the glass transition temperature ( T g) has been undertaken. In amorphous poly(ethylene terephthalate), a TSC peak is observed at 82°C. Under uniaxial orientation, it is shifted to 88°C, and under biaxial orientation, it reaches 100°C. The shift of this T g peak under stretching indicates a stiffening of the amorphous chains. The analysis of the fine structure of these complex peaks shows the existence of compensation phenomena. For uniaxially and biaxially oriented poly(ethylene terephthalate) this analysis reveals lower and upper temperature components of the glass transition. This phenomenon indicates the existence of two segregated phases.
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