Glass transition temperature (Tg)

Definition

Glass transition temperature (Tg) is the temperature at which a polymer changes from a hard and relatively brittle "glassy" state into a soft and pliable "rubbery" state. It is a critical thermal property that indicates the temperature range over which polymers undergo significant changes in mechanical properties.

Related terms

Polymerization:

The chemical process by which monomers are chemically bonded to form polymer chains.

Thermal expansion: The tendency of matter to change in shape, area, and volume in response to a change in temperature.

Viscoelasticity:

A material property that exhibits both viscous and elastic characteristics when undergoing deformation