When pyrolyzing polymer materials one can notice that generated vapours have lower temperature compared to the liquid phase.
If an endothermic pyrolysis reaction takes place in the liquid phase, then heat to crack the polymer should be absorbed from the environment i.e. from the liquid phase, causing a decrease in its temperature. And later, short chains generated during cracking should evaporate in the same manner as any liquid evaporates (physical state change) without a change of temperature.
But this is not the case! The generated vapours have a lower temperature compared to the liquid phase. What is then wrong with the above rationale? Does it mean that the pyrolysis reaction also absorbs heat from the vapour phase?
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