화학공학소재연구정보센터
Polymer, Vol.38, No.13, 3263-3268, 1997
Enthalpy Relaxation in Glassy Polystyrenes .2.
The changes in enthalpy (Delta H-infinity) 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.