Glass Transition Temperature (Part-1) || Definition and Factor affecting on Tg
Channel: PaathShaaala
Date: 2021-05-14

The Glass transition temperature (Tg) is an important characteristic of polymeric materials. It marks the point at which changes from a glassy to a rubbery state and influences many other material properties. The glass transition temperature (Tg) is described in general as the temperature at which 30–50 carbon chains start to move. At the glass transition temperature, the amorphous regions experience a transition from a rigid state to a more flexible state making the temperature at the border of the solid-state to the rubbery state.
In this video, we will understand the definition of glass transition temperature and the factors affecting the glass transition temperature.
The polymer has the temperature boundary above which it is soft and flexible men below which it becomes a hard brittle and glassy state. The temperature below which a polymer is hard and brittle and above which it is soft and flexible is called the glass transition temperature of the polymer. It is generated by symbol Tg.

Glass transition temperature depends on the following factors:
 1. Stiffness of flexibility of the polymer
 2. Molecular polarity or cohesive energy density
 3. Backbone symmetry
 4. Cross-linking and branching
 5. Copolymerization
 6. Molecular weight
 7. Plasticizer

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