Glass Transition
Tg
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Definition:
A reversible change that occurs in an amorphous polymer when it is heated to a certain temperature range. It is characterized by a rather sudden transition from a hard, glassy or brittle condition to a flexible or elastomeric condition. The transition occurs when the polymer molecule chains, normally coiled, tangled and motionless at temperatures below the glass transition range, become free to rotate and slip past each other. This temperature varies widely among polymers, and the range is relatively small for most polymers. Also known as GAMMA TRANSITION and SECOND ORDER TRANSITION.
Definition Copyright ©1989 CRC Press LLC. All rights
reserved.
Also Known As:
Glass Transition Temperature
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