Abstract
The structural relaxation process of poly(methyl methacrylate) has been studied by differential scanning calorimetry. The sample was subjected to different thermal histories with isothermal stages at ageing temperatures of 100 and 80°C for different ageing times. The enthalpy increment suffered by the sample in the isothermal stage of the thermal history (enthalpy loss due to ageing) was calculated as a function of the ageing time and temperature. The specific heat curves measured were fitted to two phenomenological models.
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