1. Non flowing temperature: the maximum temperature at which no flow occurs under a certain pressure. It is to add a certain amount of plastic bottle into the barrel at the upper end of the mouth mold of the capillary rheometer, and heat it to a certain temperature. After 10min of constant temperature, apply 50MPa constant pressure. If the material does not flow out of the mouth mold after NBA injection, after pressure relief, increase the material temperature by 10 degrees. After 10min of heat preservation, apply constant pressure of the same size, so as to continue until the melt flows out of the mouth mold, reduce the temperature by 10 degrees That is, the non flowing temperature of the material.
2. Glass transition temperature Tg: refers to the transition temperature of amorphous polymer (including the amorphous part of crystalline polymer) from glass state to high elastic state or from the latter to the former. It is the lowest temperature and the upper limit of the working temperature for the free movement of the polymer chains.
3. flow temperature TF: refers to the temperature at which the amorphous polymer changes from high elastic state to viscous flow state. It is the lower limit of processing temperature of amorphous plastics.
4. decomposition temperature Td: refers to the decomposition temperature when the temperature of substances in viscous flow state increases further, which will aggravate the degradation of the molecular chain, and when the temperature rises to make the polymer molecular chain obviously degraded, it is the decomposition temperature.
5. Melting temperature Tm: for plastic bottle crystalline polymers, it refers to the temperature at which the three-dimensional long-range ordered state of macromolecular chain structure changes into disordered viscous flow state, also known as melting point. It is the lower limit of processing temperature of crystalline polymer.