What is the glass transition temperature of polypropylene?

The glass transition temperature of PHAs is extremely low and it is below room temperature. In general, it varies from 2°C to 8°C, depending on the type of PHAs. The degree of crystallinity affects the melting temperature of PHAs. Generally, the melting temperature ranges from 160°C to 175°C.

What factors affect glass transition temperature?

Increase in pressure of surrounding leads to decrease in free volume and ultimately high Tg. Other factors like branching, alkyl chain length, bond interaction, flexibility of polymer chain, film thickness etc. also have significant impact on glass transition temperature of polymers.

How is the glass transition temperature determined?

The glass transition temperature is a characteristic temperature for the step in the measurement curve . It can be determined according to various standard methods , e.g. as the temperature at half the step height or as the point of intersection of the bisector of the angle between the tangents with the measurement curve.

What is definition of glass transition temperature?

Definition of Glass Transition Temperature: The glass transition temperature is the temperature at which an amorphous solid becomes soft upon heating or brittle upon cooling. The glass transition temperature is lower than the melting point of its crystalline form, if it has one.

What is the glass transition temperature?

For a defined grade, the glass transition temperature increases from 50 °C during post cure. A low-temperature curing grade with a cure time of less than 5 minutes at 80 °C has a glass transition temperature of about 140 °C.

What is Tg, glass transition temperature?

Glass transition temperature (Tg) is defined as the temperature at which the mechanical properties of a plastic / adhesive radically changed due to the internal movement of the polymer chains that form the plastic / adhesive. In the first part of the definition, the Tg identified as the temperature at which…