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KAS method Isoconversional method E a /kJ mol −1 E a /kJ mol −1
Abstract
The thermal behavior of sorbitol was studied under non-isothermal conditions, in both air and nitrogen atmosphere. The main process is a deep and continuous dehydration. For the kinetic analysis, the TG/DTG data obtained at five heating rates were processed by three different methods: Friedman, Budrugeac-Segal and non-parametric kinetic, respectively. This analysis indicates a complex reaction with a preponderant chemical process, described by a conversion function (1−α)3/2, accompanied by diffusion.
standard model-free (isoconversional) method ( open square ln A /min −1 , open diamond E a /kJ mol −1 , open circle linear coefficient, r 2 ) The activation energy of the evaporation process against the
, α ) with extent of conversion (isoconversional method) [ 12 – 14 , 24 – 29 ] and temperature (non-parametric kinetics method) [ 30 , 31 ]. Further, Arrhenius parameters evaluated using model-free techniques facilitate modeling of a degradation
method Kinetics parameters vary with extent of conversion at the multi-step kinetics, such as dehydration of CSH. Isoconversional methods employ multiple heating rates in order to obtain data on varying rates at a constant extent of conversion
is to be expected during the later sintering process. Figure 4 shows the activation energy in dependence of the conversion degree determined by means of the Flynn–Wall isoconversional method. For the GC-tape even a good linear
Thermoanalytical investigations of tris(ethylenediamine)nickel(II) oxalate and sulphate complexes
TG–MS and TR–XRD studies
JEOL JSM-6390 scanning electron microscope. For SEM analyses, the samples were spread on a carbon tape and made uniform by blowing air. Kinetic studies Isoconversional methods Solid state
studies of amine complexes quite significant. The kinetics of deamination and dehalogenation of hexaamminenickel(II) halides have been studied using model-free isoconversional methods viz., Flynn–Wall–Ozawa (FWO) [ 12 , 13 ], Friedman [ 14 ] and Kissinger
For the determination of the activation energy using multiple heating rates the isoconversional methods are used. Since every isoconversional method has different errors, the use of more than one method can give a range of values for the activation
, we discussed the curing kinetics based on the isoconversional method and Kamal model of the EBEPC/DDM system. Experimental part Materials 4,4′-Dihydroxybiphenol was purified by recrystallization from
