PROBLEMS OF THE CHARACTERIZATION OF THERMOANALYTICAL PROCESSES BY KINETIC-PARAMETERS .1.

On the basis of many experiments and theoretical reflections, the authors showed earlier that the courses of non-isothermal analytical curves are strongly influenced by the experimental conditions, and therefore the sense of kinetic parameters calculated from these curves is fictitious and their determination is uncertain. In the present work some further problems of this question are discussed. It was found that with combinations of strongly differing parameters nearly identical TG curves can be produced, and this situation cannot be improved even by orthogonal polynomial transformation. Further integral methods, using linearization, the estimation of the parameters is poor. The model transformed according to the conditions of the quasi-isothermal-quasiisobaric technique leads to contradictions, unambiguously showing the correlation existing between the parameters. © 1979 Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest.