What is the glass temperature of a polymer?
The glass temperature, TG, is the temperature at which the secondary bonds start to melt. Michael J. Richardson, in Comprehensive Polymer Science and Supplements, The glass temperature of a polymer increases with MW to a limiting value Tg∞ that is usually attained in the MW range 10 4 –10 5.
What is glass temperature Tg?
The glass temperature TG for a polymer is a criterion of creep resistance, in much the way that TM is for a metal or a ceramic. For most polymers, TG is close to room temperature. Well below TG, the polymer is a glass (often containing crystalline regions— Chapter 5) and is a brittle, elastic solid; rubber, cooled in liquid nitrogen, is an example.
How does mw affect glass temperature?
The glass temperature of a polymer increases with MW to a limiting value Tg∞ that is usually attained in the MW range 10 4 –10 5. One of the simplest relationships 64 expresses the change as Low MW polymers show marked deviations 65 and better agreement is found for 66
Why is glass temperature a state variable?
The glass temperature is a function of the rate of cooling and the pressure at which it was determined. At a specified rate of cooling and pressure, is a corresponding state variable for the viscoelastic properties and applications of noncrystalline polymers ( Mark et al., ; Plazek and Ngai, ).
How do meteorological parameters affect the performance of solar stills?
The meteorological parameters—wind velocity, solar radiation, sky temperature, ambient temperature, salt concentration, algae formation on water, and mineral layers on the basin liner—affect significantly the performance of solar stills ( Garg and Mann, ).
How do you calculate vapor pressure at water and glass temperatures?
The partial vapor pressures at the water and glass temperatures can be obtained from Eq. (5.21). The convective heat transfer coefficient can be obtained from d = average spacing between water and glass surfaces (m). k = thermal conductivity of humid air (W/m-°C). C = constant.
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