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The model allows to evaluate not only the curing temperature within the whole thickness of the system "coating + substrate", but also the resulting evolution of the extent of reaction as a function of time.
where x is extent of reaction (1 [greater than or equal to] x [greater than or equal to] 0.
The areas of the peak at various times under the isothermal curve were used to calculate the extent of reaction.
These studies have faced difficulties in relating changes in ultrasonic velocity to extent of reaction.
The extent of reaction at 110[degrees]C and 120[degrees]C calculated from Eq 2 is plotted as a function of reaction time, as seen in Fig.
Therefore, the main point of this paper is to establish relationships between time, temperature, extent of reaction, viscosity and ionic conductivity during the filling of the mold.
m] is a possible method by which the extent of reaction can be followed, albeit indirectly.
The dielectric property changes, converted in terms of changes of the electric conductivity for the epoxyamine reactive systems during curing, were compared to the extent of reaction, x, measured by DSC.
Isothermal differential scanning calorimetry (DSC) has been used for the estimation of kinetic parameters in which the fractional conversions are determined from the ratio of the partial-to-total peak areas by assuming that the exothermic heat evolved during cure is proportional to the extent of reaction.
With the extruder operated near its maximum torque limit because of the energy required to mix the rubber, the barrel temperature profile had to be set high (270 [degrees] C), not allowing examination of lower temperatures, which have been found previously to improve the extent of reaction (21).
Previous report has shown that dielectric data combined with temperature information can yield extent of reaction evaluation (6-8).