Question

21.11 We defined the glass transition temperature using Figure 21.1. Why does it depend on the cooling rate, and how does this affect the definition?

Answer 1

glass tranisiton temperature depents upon cooling rate and molecular weight distribution.glass transition temperature of amaterisl charectarizes the arnge of temperatures over which this glass transition occurs and it is always lower than melting point crystalline state of material.glass transition occur with either cooling or compression.

the expansion coefficient for glassy state is roughly equivalent to that of the crystalline solid.If slower cooling rates are used, the increased time for structural relaxation to occur may result in a higher dendity glass product.

considerably, at lower temperatures, the configuration of glass remains sensibly stable over increasingly extended periods of time.