The changes in enthalpy (?H8) between the experimental glass and the fully relaxed glass for two polystyrene samples of different molar masses have been estimated using the Cowie-Ferguson approach. These were then compared with the change predicted by a simple two-state conformational energy expression for the specific heat increment at constant volume. Comments on the nature of allowed motions in the glass are made. © 1997 Elsevier Science Ltd.
|Number of pages||6|
|Publication status||Published - Jun 1997|
- Enthalpy relaxation
- Equilibrium glass
- Physical ageing