Abstract
Isothermal agings have been carried out on poly(methyl methacrylate) at temperature far below the glass transition temperature region. Aging effects have been investigated by calorimetric and dynamic mechanical techniques; influence of quenching rate, time and temperature of aging have been studied. It is seen that the β-relaxation is not affected by physical aging and that the α-relaxation spreads out in the β-relaxation temperature domain. Comparison of the results obtained from the two techniques shows the occurrence of a specific mechanism for aging temperature far below the glass transition temperature.
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