Showing papers in "Thermochimica Acta in 2002"

TL;DR: A review of recent advances in the synthesis of heterocycles as energetic materials can be found in this article, where the authors focus on recent advances of the synthesis and application of hetercyclic materials in the development of pyrotechnics.

TL;DR: The thermal decomposition of borazane BH 3 NH 3 has been studied by differential scanning calorimetry (DSC) and thermogravimetry combined with the FTIR spectroscopic and mass spectrometric analysis of the gas phase as discussed by the authors.

TL;DR: In this article, the reliability of the obtained data in phase equilibria calculations is examined and the comparison of predicted values of C°pm(29815 K) with more than 300 experimental data is made.

TL;DR: In this article, the curing kinetics of diglycidyl ether of bisphenol A (DGEBA) and DGEHQ epoxy resins in the presence of TETA as a reactive diluent and triethylenetetetramine (TETA) as the curing agent were studied by non-isothermal differential scanning calorimetry (DSC) technique at different heating rates.

TL;DR: In this article, the authors summarize the current understanding of these interactions, identify significant data deficiencies, and briefly discuss the drivers of future research in this area, concluding that factors affecting leaching and transport, microbial degradation, phytotoxicity and plant uptake, and invertebrate and vertebrate toxicity are determinants of ultimate environmental fate and hazard potential.

TL;DR: In this article, model-free isoconversional methods are applied to isothermal and non-isothermal differential scanning calorimetry (DSC) data on epoxy cures, yielding a dependence of the effective activation energy on the extent of cure.

TL;DR: In this article, the limitations of model-free kinetic analysis are discussed and conditions are listed under which estimated values of activation energy could be incorrect, based on real measurements and simulations.

TL;DR: In this article, the main problem appears to be that the sample throughput of isothermal microcalorimetry is low compared to other techniques used in that field, and the non-specificity of calorimetric signals is in some cases a serious limitation.

TL;DR: In this paper, it was shown that the energy distribution among the immobilized constituents of a crystalline reactant is not represented by the Maxwell-Boltzmann equation. And the existence of such interface energy levels, with a limited range of energies, would also allow for the variation of apparent activation energy with extent of reaction, and also with temperature, reported for many complex solid state reactions.

TL;DR: In this paper, the mesoscopic processes of consolidation, deformation, and reaction of shocked porous energetic materials are studied using shock physics analysis of impact on an ensemble of discrete "crystals".

TL;DR: In this article, thermal analysis was used to screen a large number of ammonium nitrate (AN) formulations in search of possible deterrents, such as ammonium, potassium, ammonium and calcium salts of sulfate, phosphate, or carbonate.

TL;DR: In this article, the effect of crystallinity on thermal conductivity of polytetrafluoroethylene (PTFE) was investigated using an instrumented thermalconductivity apparatus (Lees disk) and by DSC.

TL;DR: In this paper, a range of thermal analytical techniques have been used to characterize PVB obtained from various manufacturers and recycled material recovered from glass recycling units, and it was concluded that recycled and blended grades of PVB could be used as a laminating agent for glass and that PVB should be recycled rather than placed in landfill.

TL;DR: In this paper, the thermal decomposition characteristics of PETN, RDX, HNS and HMX were studied using thermal analytical techniques (TG and DSC) and their compatibility with silicone rubber and the kinetic parameters such as decomposition activation energies and the frequency factor of the reaction were also evaluated by non-isothermal differential scanning calorimetry (DSC) techniques.

TL;DR: In this paper, the crystal and molecular structures of Cs(II) and Rb3(III)·H2O were determined by X-ray diffraction and the latter compound is the first structural characterization of (III) and also contains the nitrocyanamide anion, NCNNO2−.

TL;DR: In this paper, a new heat flow measurement technique was developed that greatly reduces instrument baseline defects resulting from imbalances, such as offset, slope and curvature, by accounting for the instrument heat capacity effects.

TL;DR: In this article, the authors reviewed various microscopic studies on the mechanisms of the thermal dehydration and/or decomposition reactions of inorganic solids, the physico-geometric and chemical features of the solid-state reactions were investigated.

TL;DR: In this article, a physical approach to the interpretation of the mechanisms and kinetics of thermal decomposition of solids has been applied to the investigation of decomposition mechanisms of Ag, Cd, Zn, Mg, CaMg,Ca, Sr and Ba carbonates.

TL;DR: The thermal behavior and the kinetics of decomposition of three naturally occurring available carbonates in northwest Ohio are studied using the Arrhenius equation applied to solid-state reactions as mentioned in this paper.

TL;DR: In this paper, the thermal decomposition of hydrotalcite precursors was studied using high temperature X-ray diffraction (HT-XRD) and thermogravimetry coupling with mass spectrometry (TGA-DTA-MS).

TL;DR: In this paper, a thermogravimetric (TG) and DSC coupled to a photovisual system was used to characterize rutin and quercetin.

TL;DR: An observed kinetic compensation effect (KCE) can be a result of differences in the sample or experimental conditions, be an indication of complex reaction controls, or, as shown in this survey, may be a computational artifact.

TL;DR: In this paper, the degradative process of folic acid under thermal stress was investigated using various analytical techniques such as infrared (IR) spectroscopy, Mass Spectroscopy (MS) and X-ray diffraction (XRD).

TL;DR: The non-parametric kinetics (NPK) method is a “model-free” method of kinetic analysis that does not seem to have received the attention that it deserves and deserves wider testing and also raises some interesting aspects of the philosophy behind non-isothermal kinetic analysis.

TL;DR: The model hot spot characteristics of energetic crystals, particularly, of cyclotrimethylenetrinitramine (RDX) and related materials, are described within a molecule-to-crystal-lattice to dislocation defect framework, as developed under the guidance of R.S. Miller.

TL;DR: In this paper, the authors performed dynamic kinetic analyses on CaCO3 using simultaneous thermogravimetry and differential scanning calorimetry (DSC) measurements in both wet and dry flowing Ar. Although the quality of the DSC results was inferior compared with those based on TG, it is clear that they yield different results in subsequent kinetic analyses using a wide range of numerical methods.

TL;DR: In this paper, the authors used the guide to the expression of uncertainty in measurement to determine the uncertainty of heat capacity measurements by means of differential scanning calorimetry (DSC).

TL;DR: In this paper, a new technique, called interpolation method, with general application in the kinetic analysis of processes studied by thermogravimetry (TG) under linear temperature programming is developed.

TL;DR: In this article, the authors used differential thermal analysis (DTA) to evaluate the degree of stability reached during sewage sludge treatment and found that energy release during sludge combustion shifts to higher temperatures as stabilization advances, and the integration of the DTA curve gives an area which is proportional to the energy released so it was possible to quantify this shift by representing the percentage of the cumulative area at each temperature along each sample combustion.

TL;DR: By means of the thermogravimetric (TG) method, and differential thermal analysis (DTA) with simultaneous chemical analysis of the gaseous reaction products, X-ray diffraction phase analysis, and infrared spectroscopy, stages of decomposition of Al(NO 3 ) 3 ·9H 2 O were studied as mentioned in this paper.