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The thermodynamics properties of pure epoxidised natural rubber (ENR-50) and epoxidised
natural rubber/N, N-M-Phenylenebismaleimide (ENR-50/HVA-2) compound were measured by
differential scanning calorimeter (DSC) at a heat rate 10 K/min and at temperatures ranging from
273.15 to 453.15 K. The equations and values of heat capacity, enthalpy, entropy, Gibbs free
energy and internal energy of pure ENR-50 and ENR-50/HVA-2 were found to be functions of
temperature. The equations of heat capacity, enthalpy and internal energy of pure ENR-50 and
ENR-50/HVA-2 compound behaved as polynomial equations with temperature at different order,
while entropy and Gibbs free energy of pure ENR-50 and ENR-50/HVA-2 compound behaved
as exponential equations with temperature. The Gibbs free energy for both substances was a
negative value for all temperatures ranging from 273.15 to 453.15 K.
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