Several Characteristic Temperature Interpretations of Plastic

As a PVC Plastic Tube Core Manufacturer, let's talk about the meaning of several characteristic temperatures of plastic.

1) Glass transition temperature Tg:

Refers to the transition temperature of an amorphous polymer (including an amorphous portion of a crystalline polymer) from a glassy state to a high elastic state or by the latter. It is the lowest temperature for the free movement of the macromolecular segment of the amorphous polymer and the upper limit of the working temperature of the product.

2) Melting temperature Tm:

For a crystalline polymer, the temperature at which a three-dimensional remote ordered state of a macromolecular chain structure is transformed into a disordered viscous state also called a melting point. It is the lower limit of the processing temperature of the crystalline polymer molding.

3) Flow temperature Tf:

Refers to the temperature at which an amorphous polymer changes from a highly elastic state to a viscous state. It is the lower limit of the processing temperature of amorphous plastic.

4) No flow temperature:

The maximum temperature at which no flow occurs under a certain pressure. A certain amount of plastic is added to the barrel at the upper end of the capillary rheometer die, heated to a certain temperature, and after constant temperature for 10 minutes, constant pressure of 50 MPA is applied. If the material does not flow out of the die, the temperature rises after the pressure are released. At a temperature of 10 degrees, constant pressure of the same magnitude is applied after 10 minutes of incubation, and so on until the melt flows out of the die, and the temperature is reduced by 10 degrees, which is the no-flow temperature of the material.

5) Decomposition temperature Td:

When the temperature of the polymer in the viscous flow state is further increased, the degradation of the molecular chain is intensified, and the temperature at which the polymer molecular chain is significantly degraded is the decomposition temperature.

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