(1) Glass transition temperature Tg: refers to a transition temperature of an amorphous polymer (including an amorphous portion in 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 is also 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 referred to as 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 the amorphous polymer changes from a highly elastic state to a viscous flow state. It is the lower limit of the processing temperature of amorphous plastic.
(4) No-flow temperature: The highest 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 the constant temperature is known to apply a constant pressure of 50 MPa after 10 minutes. If the material does not flow out of the die, the material temperature will be released after the pressure is released. The difficulty is increased by 10 degrees, and the same amount of constant pressure is applied after 10 minutes of incubation, and this is continued 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: refers to the polymer in the viscous flow state, when the temperature 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.
Stainless Steel Tea Strainer,Teapot With Strainer,Loose Leaf Tea Strainer,Plastic Tea Strainer
YANGJIANG VOSSEN INDUSTRY AND TRADE CO.,LTD , https://www.cnvossen.com