Interpretation of several temperatures in the plastics industry

Interpretation of several temperatures in the plastics industry

(1) Glass transition temperature Tg: refers to the transition temperature of an amorphous polymer (including the non-crystalline part of a crystalline polymer) from a glass state to a high elastic state or from the latter to the former. It is the lowest temperature at which the macromolecular chain segments of amorphous polymers can move freely, and it is also the upper limit of the working temperature of the product.

(5) Decomposition temperature Td: refers to the polymer in a viscous state. When the temperature is further increased, the degradation of the molecular chain will be intensified, and the temperature at which the polymer molecular chain is significantly degraded is the decomposition temperature.