Abstract
A comparative study of amorphous, uniaxially and biaxially oriented films was performed using thermally stimulated current (TSC) spectroscopy. The TSC peak around the glass temperature (T/sub g/) was investigated. In amorphous polyethylene terephthalate (PET) a TSC peak was observed at 82 degrees C, while under uniaxial orientation, it was shifted to 88 degrees C, and under biaxial orientation, it reaches 100 degrees C. The shift of this T/sub 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 PET this analysis reveals a lower and upper temperature component for the glass transition. This phenomenon indicates the existence of a segregated phase. >
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