Abstract
The effect of physical aging on stress and birefringence relaxation behaviors in polycarbonate (PC) glass was investigated. The birefringence relaxed monotonically at the glass transition-to-rubbery plateau region for the non-aged PC, suggesting that chain orientation relaxes in a single relaxation process in this region. On the other hand, stepwise relaxation behavior was observed in birefringence for the aged PC. The birefringence relaxation curves at various temperatures for the aged PC could not be superimposed by horizontal shift. The complicated relaxation behavior could be caused not only by the physical aging but also by the rejuvenation of enthalpy during the relaxation measurement.
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