Search results
Results from the WOW.Com Content Network
The glass transition of a liquid to a solid-like state may occur with either cooling or compression. [10] The transition comprises a smooth increase in the viscosity of a material by as much as 17 orders of magnitude within a temperature range of 500 K without any pronounced change in material structure. [11]
Polycarbonate has a glass transition temperature of about 147 °C (297 °F), [8] so it softens gradually above this point and flows above about 155 °C (311 °F). [9] Tools must be held at high temperatures, generally above 80 °C (176 °F) to make strain-free and stress-free products.
The glass transition temperature (T g) is around 45 °C. [1] PCTFE has one of the highest limiting oxygen index (LOI). [16] It has good chemical resistance. It also exhibits properties like zero moisture absorption and non wetting. [15] [17] It does not absorb visible light. When subjected to high-energy radiation, it undergoes degradation like ...
Glass Transition Temperature: 82 °C (180 °F) [5] Melting point: 100 °C (212 °F) to 260 °C (500 °F) [5] ... (after polyethylene and polypropylene). About 40 ...
The glass transition temperature of these polymers can exceed 200°C. [1] COC resins are commonly supplied in pellet form and are suited to standard polymer processing techniques such as single and twin screw extrusion , injection molding , injection blow molding and stretch blow molding ( ISBM ), compression molding , extrusion coating ...
The Flory–Fox equation relates the number-average molecular weight, M n, to the glass transition temperature, T g, as shown below: =, where T g,∞ is the maximum glass transition temperature that can be achieved at a theoretical infinite molecular weight and K is an empirical parameter that is related to the free volume present in the polymer sample.
PVDF has a glass transition temperature (T g) of about −35 °C and is typically 50–60% crystalline. To give the material its piezoelectric properties, it is mechanically stretched to orient the molecular chains and then poled under tension.
When the supercooled liquid is further cooled, it becomes a glass. [1] The temperature at which a polymer becomes a glass by fast cooling is called the glass transition temperature T g. At this temperature, viscosity reaches up to 10 13 poise depending upon cooling-rate.