In particular, the difference in ignition propensities was observed at temperatures at which the low temperature branching reactions are active.
In addition, it is found that isolated high temperature branches can exist in the adiabatic reactor when Lep < 1.
In their presence we derive multiple steady-state solutions with stable low and high temperature branches, and an unstable intermediate branch.
Unlike the pseudohomogeneous model where the maximum exit temperature cannot exceed the adiabatic temperature rise (Pem → ∞), the heterogeneous model can have isolated high temperature branches that exist when particle Lewis number is less than unity.
It appears that the addition of molecular oxygen to benzylic-type radicals leads to a double peroxidation and low temperature branching only when the transfer of hydrogen in the isomerization step occurs either from an ortho-alkyl group, or from another carbon atom of the same alkyl chain.
Conditions under which biological activity can result in the initiation of an elevated-temperature branch within the compost pile which does not pose the risk of spontaneous ignition are identified.
A matter of principle, the largest effect from amino-MMT additive, including the substantial changes in the α-relaxation peak temperature position and disappearance of the above lower-temperature branch, is detected already after embedding 0.025 wt.
This peak is overlapping with the less intense peak (lower-temperature branch) at about 220°C which may be attributed, obviously, to unfreezing dynamics in some of matrix nanovolumes with non-completed cross-linking (network defects).
Their competition with the low-temperature branching channel finally leads to the first-stage NTC behavior.
Some of the diagrams contain isolated high-temperature branches and solution profiles on these branches show a local maximum in the surface temperature.
Results show that the delay has a turnover behavior as temperature increases, being dominated by the competition of low-temperature branching and termination channels as well as the competition of forward and reverse reaction channels.
