In this work the influence of Cu admixtures on the crystallization process of amorphous Fe-Si-B alloys is studied, based on
measurements of differential thermal calorimetry of the series Fe75-xCuxSi9B16 (x=0, 1, 2, 2.8 and 3.5) during their heating with different heating rates. The first crystallization stage can not be traced
for any of the amounts of Cu content examined, while the second stage is observed only when the Cu content is 1 at%. The activation
energy as estimated with Kissinger's method for the third crystallization stage has a mean value of 326 kJ mol-1 and with the isoconversional Flynn, Wall and Ozawa method is almost constant when 0.05<a<0.6 and exhibits a small monotical
decrease when a>0.6. The main crystallization peak can not be described by means of a single JMA-type function.
Authors:A. Małecki, B. Prochowska-Klisch, and R. Gajerski
It has been found that the modified Zhuravlev equation, [(1−α)−1/3−1]2=ktn, which describes the kinetics of oxidation of V2O4 and V6O13 in the temperature range 820–900 K and in the oxygen pressure range 1.0–20 kPa, can be derived via the assumption that the
changes in the observed activation energy result from the changing contributions of the two diffusion processes controlling
the reaction rate. The values of the observed activation energy are in the range 160–175 kJ mol−1 for V2O4 and 188–201 kJ mol−1 for V6O13 in the scope of the experimental oxygen pressures and temperatures and conversion degrees of 0.1–0.9.
In this research, the relationship between particle size and combustion kinetics and combustion properties of lignite samples
was examined by utilizing the thermogravimetric (TG/DTG) and differential thermal analysis (DTA) techniques. The lignite samples
separated into different size fractions were subjected to non-isothermal thermogravimetric analysis between ambient and 900�C
in the presence of 50 mL min−1 air flow rate. Activation energy (E) and Arrhenius constant (Ar) of combustion reaction of each size was evaluated by applying Arrhenius kinetic model to the resulting data. Combustion
properties of the samples were interpreted by careful examination of the curves. The apparent activation energies in major
combustion region were calculated as 41.03 and 53.11 kJ mol−1 for the largest size (−2360+2000 μm) and the finest size (−38 μm), respectively.
Effects induced by γ -irradiation in the dose range of 0-10 Mrad on Tuffak polycarbonate track detector films have been studied
by thermogravimetry (TG). The samples were irradiated with 60Co γ -rays for doses of 3, 5 and 10 Mrad. The TG studies indicate that unirradiated and the γ -irradiated samples degrade
in two steps. The kinetics of the two steps of degradation was also evaluated from the TG curves. Irradiation enhances the
degradation rate and the effect increases further with increasing radiation dose. The activation energy values calculated
for all the steps decrease on irradiation. A linear relationship observed between the decrease in activation energy and the
dose received by the sample suggests the possibility of the use of Tuffak polycarbonate detector as γ dosimeter.
For the enhancement of thermal stability of poly(p-dioxanone) (PPDO), the isocyanate end-capping reagent was prepared by treatment of toluene-2,4-diisocyanate with an equivalent
of 1-hexyl alcohol. The end-capping reagent and the end-capping PPDO with an inherent viscosity of 0.26 dL g−1 were characterized by FTIR and 1H-NMR. Thermal stability of the end-capping PPDO with an inherent viscosity of 0.92 dL g−1 was investigated isothermally and non-isothermally under air atmosphere using thermogravimetry. It has been shown that the
addition of the prepared isocyanate can enhance significantly the thermal stability of PPDO. The activation energies for non-isothermal
degradation estimated by Kissinger method and Friedman method are 91, 81 kJ mol−1 for as-prepared PPDO, and 160, 149 kJ mol−1 for the end-capping PPDO, respectively. The activation energy increases by about 70 kJ mol−1 through the end-capping.
Authors:W. Lopes, Crislene Morais, A. Souza, V. Leite, and B. de A. Firmo
decomposition kinetic of three lanthanide mixed complexes with the general
formula of Ln(thd)3phen (where Ln=Nd3+,
Sm3+ or Er3+, thd=2,2,6,6-tetramethyl-3,5-heptanodione and phen=1,10-phenanthroline) has been studied in this
work. The powders were characterized by their melting point, elemental analysis,
FTIR spectroscopy and thermogravimetry. The isothermal TG curves have been
recorded under the same conditions at 265–285, 265–285 and 250–270°C
for Nd(thd)3phen, Sm(thd)3phen
and Er(thd)3phen, respectively.
parameters, i.e. activation energy, reaction order and frequency factor were
obtained through the technique of lineal regression using the relation g(α)=kt+g0. The analysis was done
at decomposed fractions between 0.10–0.90. The values of activation
energy were: 114.10, 114.24 and 115.04 kJ mol–1
for the Nd(thd)3phen, Sm(thd)3phen
and Er(thd)3phen complexes, respectively. The kinetic
models that best described the isothermal decomposition reaction the complexes
were R1 and R2. The values of activation energy suggests the following decreasing
order of stability: Nd(thd)3phen<Sm(thd)3phen<Er(thd)3phen.
The aim of this work is to highlight the importance of controlling the residual water vapour pressure above the sample as
well as the rate of the thermal decomposition during the thermal dehydration of cerium cyclotriphosphate trihydrate CeP3O9·3H2O.
For this reason, the dehydration of the titled compound was followed by both techniques: the constant rate thermal analysis
at PH2O = 5 hPa and the conventional TG-DTA in air.
It has been shown that the pathway of the thermal dehydration depends strongly on the nature of atmosphere above the sample.
However, in air atmosphere CeP3O9·3H2O decomposes in two well defined steps to give first an amorphous, phase in the temperature range 440–632 K, then the cerium
polyphosphate Ce(PO3)3 crystallizing in orthorhombic system (C2221) at T>632 K. Whereas decomposition carried out at 5 hPa water vapour pressure, also occurring in two steps, leads first to a crystallized
intermediate monohydrate at 259<T<343 K and second to a crystallized anhydrous cerium polyphosphate, at 343<T<791 K, with a structure different from those of all lanthanide polyphosphate known actually and particularly from that of
Ce(PO3)3 obtained in air.
The activation energy corresponding to the dehydration of the initial phosphate was also measured experimentally by means
of two CRTA curves and was found equal to 81±5 kJ mol−1.
Authors:W. Sułkowski, J. Borek, A. Danch, A. Radoń, A. Sułkowska, J. Ossowski, G. Toborowicz, and A. Bernatek
Spontaneous structural changes of a polymer that is its ageing due to thermal energy, radiation energy, chemical compounds
and micro-organisms lasting at least several season cycles change the characteristics of polymer products. Changes of polymer
characteristics found during ageing can be reversible or irreversible. The most substantial changes occur as the result of
UV radiation. Tests of selected aliphatic diamides of terephthalic acid as stabilisers of low density polyethylene (LD-PE)
used for the production of gardening films were performed. Accelerated ageing of films for a period of one year was done in
the Xenotest Alpha type apparatus. Studies were made for 0.1 mm thick commercial films. Studies of selected mechanical properties
of LD-PE films without stabilisers and of LD-PE sheeting containing an addition of one of the synthesised diamides of terephthalic
acid or the standard Tinuvin 783 stabiliser were performed before and after the ageing process. To determine the effect of
stabilisers on the ageing process of LD-PE films, thermogravimetric analysis was applied. This allowed us to determine the
decomposition activation energy of the investigated films before and after the ageing process and the influence of stabilisers
on the observed changes.
In this research, pyrolysis and combustion behavior of three different oil shale samples from Turkey were characterized using
thermal analysis techniques (TG/DTG). In pyrolysis experiments, two different mechanisms causing mass loss were observed as
distillation and cracking. In combustion experiments, two distinct exothermic peaks were identified known low and high temperature
oxidation. On the other hand, determination of activation energies are required for the estimation of oil extraction conditions
from the oil shales. Differential methods are used to determine the activation energies of the samples where various f(α) models are applied from the literature. It was observed that the activation energies of the all oil shale samples are
varied between 13.1–215.4 kJ mol−1 in pyrolysis and 13.1–408.4 kJ mol−1 in combustion experiments which are consistent with other kinetic results.
Authors:W. Sułkowski, S. Mistarz, T. Borecki, M. Moczyński, A. Danch, J. Borek, M. Maciążek, and Anna Sułkowska
From the TG data of rubber
granulates, different polyurethane and composites it can be seen that the
thermal decomposition for the rubber granulate and all of the composites start
above 520 K. Two major mass losses for the rubber granulates and majority
of the composites were observed and thermal decomposition is essentially complete
by ~820 K. The changes of activation energies of lower and higher temperature
decomposition, calculated according to the different equations were observed
for a priori assumed first-order reaction for devolatilisation. Differences
between determined and calculated results could suggest a possible reaction
between polyurethane agents and rubber granulate during the composites formations.