band of AP containing complexes 1-3 showed multiple broad and flat peaks, suggesting a complicated mechanism of decomposition.
It is well explained by the results of the previous hydration heat that the five kinds of esters make the cement hydration induction end time longer and postpone the second exothermic
peak, that is, the esters have a delayed effect on the hydration reaction rate at the early stage of cement (hydration induction period and the acceleration period).
The calculated activation energy for the shown exothermic
events, according to the standard ASTM E698-11, were obtained using the angular coefficients values with support of Arrhenius equation .
In contrast, exothermic
peak temperatures of the studied kaolins were lower than those for Makoro and Kgwakgwe.
So upon AN thermolysis in the cuvette of 5 mm in diameter at the temperature range 280.350[degrees]C the signal of measuring thermocouple detects mainly endothermic processes corresponding to reactions (4) and (6), showing almost no exothermic
processes implemented in the gas phase.
The OZSBO/pMDI resins with eq-MRs of 1:0.5, 1:0.75, and 1:1 exhibited exothermic
reactions at 150[degrees]C, eqMRs of 1:2 and 1:3 showed exothermic
peaks at 185[degrees]C, and an eq-MR of 1:4 presented an exothermic
peak at 180[degrees]C.
This would then be followed by an exothermic
step involving the expulsion of an activated ion, [CHS-HA.sup.+n*] [right arrow] CHS-H + [A.sup.+n*], followed by the line emission from the cation, [A.sup.+n*], [A.sup.+n*] [right arrow] [A.sup.+] + hv.
We observe from Figures 4 and 5 that velocity and temperature profiles increase with the increasing values of [lambda] for exothermic
reaction, but opposite effects are found in these figures for endothermic reaction.
[ILLUSTRATION OMITTED] Exothermic
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