A2 Treatment of TGA signals

In most cases an Arrhenius behaviour is assumed and the mass loss is 

A(log[w-w (oo)] are correlated with each other according to straight line. One can therefore draw the values of and n. 

In the case of a dehydration process, one can describe the signal as the result of the combined effect of two driving forces, namely temperature increase and gradient of the chemical potential across the core-to-surface span, since the evaporation rate becomes significant at the surface, but is indeed limited by the supply of further molecules that diffuse from the internal regions toward the surface, because of temperature and concentration gradients 

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