A kinetic interpretation of such behaviour is that given sufficient time, the continuous production of intermediate species (e.g., aldehydes) results in the increased production of hydroperoxyalkyl radicals (QOOH) and hydrogen peroxide ([H.sub.2]O2), which favour chain-propagation reactions, thus leading to enhanced cool flame
exothermal activity [52].
(4) [DELTA][H.sub.cc]: The
exothermal enthalpy of PLA cold-crystallization (re-crystallization).
The first
exothermal effect during pyrolysis and oxidation of hemicellulose became apparent at the temperature of 84-405[degrees]C (max ~330.6[degrees]C).
The reaction of Ca with tantalum oxide (5) and ferric oxide (6) liberates an additional
exothermal effect.
During this slow
exothermal reaction, heat will be emitted; however, no flames will be present, just a glow.
Injectable bioactive minerals, which provide immediate stability, harden with limited
exothermal reactions and are strong enough to allow for an early and active rehabilitation will allow function to be restored more rapidly [5-8].
This assumption is confirmed by the fact that the
exothermal effect occurred at the temperature of 350[degrees]C (fig.
The first, and most important, increase in temperature is caused by an acceleration of the
exothermal hydration reactions, which reach a peak value after 11 hrs, when the hydration reaction is at its maximum efficiency.
This explanation was used by Krauss and Roos to explain a second "
exothermal peak" which occurred when the irradiation was stopped after the first minimum and restarted 16 h later.
The dynamic capability of the bellows design dissipates the
exothermal and mechanical energy.
Axson reports that, having been certified by independent laboratories, all offer excellent insulation, resistance to thermal shock, low
exothermal qualities, and ease of use.