The kinetic investigation of thermoanalytical curves for the ethyl acetate and alkaline hydrolysis, requires tedious calculations
of several mathematical expressions, to establish the correlation between the thermochemical and kinetic parameters. Using
the DSC measured data for the heat flow-temperature dependence of the studied reactions, we have obtained the kinetic bulk
parameters and the dependencek=k(T) for the basic and acid hydrolysis of ethyl acetate.
Authors:T. Zaharescu, V. Meltzer, R. Vilcu, and D. Oprea
The thermal effect of mixing of EPDM and IIR was studied by differential scanning calorimetry over the temperature range between
335 and 435 K. O'Neill's method was used for calculating the specific heat capacity with alumina as standard. The greater
the butyl rubber content, the lower the heat capacity. The presence of butyl rubber induces a marked thermal instability because
of isobutylene units. It is possible that a rearrangement occurs in the molecular sequence, accompanied by secondary reactions
involving free radicals. The contribution of each component to the cP of the tested polymeric systems is discussed. Differences
between theoretical and experimental specific heat capacities increase as the operation temperature is raised. The relationship
between the contributions of the two components to the specific heat capacity values of mixtures can be described by a first
order equation, named the law of reciprocal thermal affinity. This aspect can be ascribed to the interaction of various reacting
entities, which form certain units with low molar heat capacity.