Although the reaction heat for the copolymerization UP/styrene or for the homopolymerization of styrene are not rigorously equal, the structure of these double bonds (conjugated with an aromatic ring for styrene, or with carbonyl functions for UP) are close enough to consider, in a first approach, that the molar enthalpy of reaction
is the same for the homo- and copolymerization.
The enthalpy of reaction
for this reaction is calculated (using MOPAC/AM 1 Hamiltonian [ref.
The energy of activation (Ea) to start the reaction, nth order kinetics, maximum peak temperature, and the total thermal energy of reaction or enthalpy of reaction
([DELTA]H) were the kinetic parameters evaluated.
At concentrations below 5% there is no significant contribution to the enthalpy of reaction
for the epoxy + montmorillonite two part mixtures.
From the DSC plots, the enthalpy of reaction
T] is the thermal conductivity of the resin, [Delta]H is the enthalpy of reaction
Thus we measured the residual enthalpy of reaction