Kinetic theory of the glass transition

For larger changes in the time or frequency frame, values of 6-l°C are obtained from equation (8.48), in agreement with experiment. For example, if Ar = 1 X 10 °, an average value of 6.9°C per decade change in Tg is obtained. The kinetic theory of the glass transition, to be developed in this section, considers the molecular and macroscopic response within a varying time frame. 

All the foregoing discussion is a presentation of the kinetic theory of the glass transition. It has many merits, not least being that it is the theory most easily understood by persons with a background in a molecular science. However, it is not the only theory, and we should be aware of the existence of alternative explanations of the processes that we have just described. 

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