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Abstract  

The properties of hydraulic mortars were studied by means of simultaneous thermal analysis (STA), according to a procedure proposed in the literature. Hydraulic limes, cement and/or slaked lime were mixed using different proportions of both inert and reactive aggregates, in order to test the effectiveness of such procedure in distinguishing the different degree of hydraulicity of such samples. The use of the normalized coordinates suggested in the literature results in overlapping of the clusters of different kinds of mortars. Modified coordinates are proposed, which give promising results in view of outlining a ‘master curve’ of hydraulicity.

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Abstract  

A mass spectrometer coupling system for simultaneous TG/DSC/DTA-QMS measurements will be introduced that is capable of operation at temperatures up to 2000°C. The coupling is maintained at a temperature very close to that of the sample, minimizing condensation, and features an extremely short gas flow path. The efficiency of this coupling system will be demonstrated through examples from the area of polymers, ceramics, metallurgy and recycling.

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Abstract  

A thermal strengthening process, which occurs during low-temperature heating of binder-free silicon nitride, has been investigated using simultaneous thermal analysis, dilatometry and FTIR and shown to occur in separate stages over clearly identifiable temperatures. Reactions which give the strengthening are the loss of physically and chemically combined water and the decomposition of ammonium carbonate and various hydrosilicates. Compacts have bend strengths of 8–10 MPa after strengthening at 500°C and 30–34 MPa after strengthening at 900°C. High-temperature dilatometry shows several stages of sintering. The maximum rate occurs at 1800°C with shrinkage commencing at 1450°C. Densities of 98.3% theoretical are obtained on heating to 1900°C.

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Abstract  

Ethylene vinyl acetate copolymers were investigated by means of simultaneous thermal analysis (STA) and pyrolysis gas chromatography (Py-GC). Both devices are coupled to a mass spectrometer (MS). STA-MS revealed that the calibration with poly(vinyl acetate) leads to sufficient accuracy in relation to the vinyl acetate (VA) content, because of the linear calibration plot.Quantitative determination of VA by means of Py-GC-MS was carried out at both 500 and 700°C. The calibration plot in this method was linear provided that the mass of VA did not exceed a critical value.

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Abstract  

A recently-developed quadrupole mass spectrometer system specifically designed for thermal analysis studies, has been linked to a thermobalance and a simultaneous TG-DTA unit, for evolved gas analysis. The performance and applicability of the system is illustrated by examples from four fields of study

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.3 ± 0.5/41.6. Thermogravimetric experiments in hydrogen atmosphere were carried out on a Q-1000 derivatograph modified for operation in different atmospheres. Simultaneous thermal analysis was made on an STA 409 PC Luxx ® device (NETZSCH

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Summary Thermal analysis methods were used in characterization of masonry mortars and bricks. Simultaneous thermal analysis and evolved gas analysis provided distinctive results for lime based mortar, mortars containing natural cement, and mortar

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Comparative study of HMX and CL-20

Thermal analysis, combustion and interaction with aluminium

Journal of Thermal Analysis and Calorimetry
Authors: O. Ordzhonikidze, A. Pivkina, Yu. Frolov, N. Muravyev, and K. Monogarov

HMX and CL-20 is of key importance to meet the advanced performance objectives of solid propellants. One of methods for investigation of thermal decomposition of energy-intensive substances is a simultaneous thermal analysis (STA), those

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Abstract  

A simultaneous thermal analysis/mass spectroscopy system was used for the determination of halogenated hydrocarbons in polymeric foam insulation materials. The investigation of ten different polymeric foams show that this equipment is a sensitive and reliable tool for the identification and determination of the bubbling agent. The results are compared with the Purge and Trap method.

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