Showing papers in "Thermochimica Acta in 1993"

TL;DR: In this paper, the Sestak-Berggren equation was used to study the kinetics of an epoxy resin based on diglycidyl ether of bisphenol A, cured by methyl tetrahydrophthalic anhydride with an accelerator.

TL;DR: In this article, the International Temperature Scale of 1990 (ITS-go) was used to calibrate scanning calorimeters (DSC) and instruments for differential thermal analysis (DTA), irrespective of the instrument type.

TL;DR: Experimental data available for the thermophysical properties of stainless steels have been searched, compiled, critically evaluated, analyzed, and correlated as mentioned in this paper, and particular attention was given to material characteristics such as alloy composition, microstructure, and conditioning treatments.

TL;DR: In this article, the thermal decomposition of urea, of related compounds and of thiourea was investigated by means of TGA and DSC measurements together with evolved gas analysis (EGA), achieved by connecting an FTIR spectrometer to the outlet of the thermobalance.

TL;DR: In this paper, a Du Pont differential scanning calorimeter (DCS) and thermogravimetric analyzer (TGA) were used to characterize pyrolysis and combustion properties of two heavy crude oils.

TL;DR: In this article, a general analytical solution relating conversion to temperature by means of integral procedures was developed. But the results obtained by using the general analytical solutions were compared with those evaluated by using established methods which were classified into three categories: integral, differential and special methods.

TL;DR: In this article, a linear dependence of the logarithm of the Arrhenius temperature integral ln p(x) on x (= E R T ), its slope on x−1 and its intercept on In x, respectively, has been derived for non-isothermal experiments.

TL;DR: In this paper, the determination of the most probable mechanism function and calculation of the kinetic parameters of decomposition of manganese oxalate have been achieved by a new kinetic analysis procedure under nonisothermal conditions in both dry and wet N 2.

TL;DR: In this article, the thermal decomposition of solid cyclodextrins (CyDs) and of metal-β-CyD complexed (metal = Ca, Zn, Cd) has been studied by thermal analysis under the same conditions.

TL;DR: In this paper, an equation is deduced from the differential thermogravimetry curves and an attempt is made to obtain the peak maxima information theoretically from the DTM curves.

TL;DR: In this paper, the regeneration conditions of a sample of La 2 O 3 exposed to atmospheric H 2 O and CO 2 for a long period of time have been carried out, and the results suggest that exposure of lanthanum oxide to the air results in the formation of the hydroxide and an amorphous hydroxycarbonate phase.

TL;DR: It is concluded that through a microcalorimetric analysis, it is possible to differentiate between healthy and tumorous tissue samples on the basis of a varyingly higher metabolic activity of the malignant samples.

TL;DR: In this paper, a relationship between the value of α at the maximum reaction rate (αmax) and the reaction mechanism has been deduced mathematically from the fundamental rate equations for the solid state reaction.

TL;DR: In this article, the authors present the results from a study of the thermal decomposition and thermal stability of NTO (3-nitro-1,2,4-triazol-5-one).

TL;DR: In this paper, the equilibria between various boron nitride phases over a wide range of pressures and temperatures were calculated and a new BN phase p,T-diagram was proposed.

TL;DR: The theory of heat conduction by phonons is reviewed in this article, with emphasis on ordinary and high temperatures, and the spectral contribution to the conductivity is discussed for various resistive processes.

TL;DR: In this article, the ternary mixtures x 1 C 5 H 12 O + x 2 C 6 H 14 + x 3 C v H 2 v +2, with v = 10 and 12, were measured at 298.15 K in a flow microcalorimeter.

TL;DR: In this article, the melting points of the aminoderivatives 1-amino-2,4,6-trinitrobenzene (PAM), 1-diamino-1-4, 6-trinitrophenylamine (DATB), 1,3,5-triammo-2.4,7-triazine derivatives (TPM), 2,2',4,4-, 6-6-hexanitrodiphenylamines (DPA), 2.2', 4,6-, 6

TL;DR: In this article, the enthalpies of dilution of aqueous solutions at 25°C have been determined for the amino acids β-alanine, α-aminobutyric acid, γ-amino acid, ϵ-aminocaproic acid, α -aminovaleric acid (norvaline), and threonine.

TL;DR: In this article, the authors analyzed the complex process comprising chemical reaction and diffusion by means of the previously proposed approach and showed that the proposed approach identifies the hypothetical scheme of the process, reveals the limits of its proceeding in a kinetic or diffusion regime, and estimates their kinetic parameters.

TL;DR: In this article, the effect of the presence of a ferruginous compound on the thermal decomposition of ammonium perchlorate (AP) was studied using a differential thermolanalysis (DTA) and a thermogravimetric analysis (TGA).

TL;DR: In this article, the glass transition in polystyrene-ethylene at pressures up to 78 atm was studied using a Tian-Calvet heat-flow calorimeter.

TL;DR: In this paper, the disquac interaction parameters for the linear organic carbonate-alkane, carbonate cyclohexane and carbonate CCl 4 contacts are revised on the basis of new experimental data on vapor-liquid equilibria for dimethyl or diethyl carbonate + n -alkane mixtures.

TL;DR: The need for reference materials to check these dilatometers can usually be met by rods of OFHC Cu, semi-conductor grade Si, W, Pt (rather expensive!), sapphire (of specified orientation) etc. as mentioned in this paper.

TL;DR: The integration of data from differential scanning calorimetry to obtain enthalpy vs. time or temperature curves can be performed easily and painlessly with modern thermoanalytical instruments interfaced with computers as mentioned in this paper.

TL;DR: The power compensated differential scanning calorimetry (DSC) can be considered as a linear system to a first approximation as mentioned in this paper, and the theory of linear response is applicable to describe the apparatus.

TL;DR: In this paper, an internal liquid bath which can be fitted into the furnace of a Perkin-Elmer DMA-7 has been developed, allowing the samples to be tested by dynamic mechanical analysis (DMA) in a liquid medium, not only under isothermal condition but also in the temperature scan mode.

TL;DR: In this paper, the heat capacity of liquid halogenated hydrocarbons of the types X(CH 2 ) n X and RX, where X = Cl, Br and I and R = alkyl or phenyl group, have been measured by using a precise micro drop heat-capacity calorimeter.

TL;DR: In this paper, the thermal decomposition of 1-methyl-5-aminotetrazole and 1,5-diaminotetaxole has been studied using thermogravimetry, differential scanning calorimetry and thermal volumetric analysis.

TL;DR: In this article, solid state Ln-DMBP compounds, where Ln represents trivalent lanthanides (except for promethium) and yttrium, and DMBP is 4-dimethylaminobenzylidenepyruvate, were prepared.