13. Below Tg: aging phenomenon
On cooling, the liquid passes into a non-equilibrium state at T g . At a temperature T < T g , its structure is apparently frozen in the state it had at T g . Molecular movements corresponding to α-relaxations are extremely slow, but nevertheless persist. This mobility enables the system to evolve very slowly towards the liquid equilibrium state. In practice, all the physical properties of glass evolve: this is the aging phenomenon. The lower the temperature T, the slower this evolution and the greater the imbalance to be corrected.
13.1 Calorimetric signs of aging
In particular, a slow decrease in enthalpy is observed...
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Below Tg: aging phenomenon
Below Tg: non-linearity
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