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Glass Transition Temperature
Tg
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Definition: The approximate midpoint of the temperature range at which there occurs a break or discontinuity in the curve when molar volume V is plotted against temperature. It is graphed as follows:

The glass transition manifests itself as a tremendous change in viscosity over a small temperature range. A rigid amorphous polymer softens to a flexible rubberlike material or a viscous liquid in the glass transition region. The most reliable estimates are normally obtained from the loss peak observed in dynamic mechanical tests or from dilatometric data.
Definition Copyright ©1989 CRC Press LLC. All rights reserved.

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