Search results
Results from the WOW.Com Content Network
Its main competitors in this application are styrene-butadiene rubber (SBR) and natural rubber. Polybutadiene has the advantage compared to SBR in its lower liquid-glass transition temperature, which gives it a high resistance to wear and a low rolling resistance. [19] [27] This gives the tires a long life and low fuel consumption. However, the ...
The glass transition temperature (T g) of the polybutadiene blocks is typically −90 °C and T g of the polystyrene blocks is +100 °C. So, at any temperature between about −90 °C and +100 °C Kraton SBS will act as a physically crosslinked elastomer.
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]
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.
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.
Glass transition temperature (°C) −65 −50 Polydispersity: 2.1 4.5 ... It is used at moderate temperature up to 85 deg C, (358 K) for aqueous systems. [10]
The onset temperature of the transition zone, moving from glassy to rubbery, is known as the glass transition temperature, or T g. In the 1940s Andrews and Tobolsky [ 6 ] showed that there was a simple relationship between temperature and time for the mechanical response of a polymer.
Its glass transition temperature is approximately 105 °C (221 °F). [4] ABS is amorphous and therefore has no true melting point. ABS is a terpolymer made by polymerizing styrene and acrylonitrile in the presence of polybutadiene. The proportions can vary from 15% to 35% acrylonitrile, 5% to 30% butadiene and 40% to 60% styrene. The result is ...