Abstract
Abstract The high impact strength of glassy polycarbonate has been suggested to be related to an excess free volume, a large low temperature beta transition, or a unique morphology. To determine how crystallization affects free volume, molecular motion and morphology, samples of amorphous and partially crystalline polycarbonate have been studied by means of specific volume and dynamic mechanical measurements, electron microscopy and x-ray diffraction techniques. Previous studies have given conflicting results concerning the effect of crystallization on the low temperature beta transition below Tg . Our results clarify this matter by showing that crystallization and residual solvent give different effects on the beta transition. Crystallization is shown to decrease the intensity of the beta loss peak suggesting that the beta motion occurs in the “non-crystalline” regions of the polymer. Solvent not only decreases the beta peak intensity, but also shifts the peak maximum to lower temperatures and causes an ...
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