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The Glassy Amorphous State

U. W. Gedde
Published 1999 · Materials Science

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Let us consider a polymer which is in its molten state. What may happen when it cools down? The two possibilities are shown in Fig.5.1. The polymer may either crystallize (route a) or cool down to its glassy, amorphous state (route b). The temperature at which the slope in the specific volume—temperature graph (route b) changes is referred to as the glass transition temperature, T g . Rigid-rod polymers, i.e. polymers with very inflexible groups in the backbone chain or in side chains, may form liquid-crystalline states, an issue dealt with in Chapters 6.
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