Thermogravimetry combined with chemical ionization mass spectrometry a new technique in thermal analysis
TL;DR: In this paper, a thermobalance and a quadrupole mass spectrometer with chemical ionization (CI) was used to investigate thermal decomposition reaction under normal pressure most efficiently.
About: This article is published in Thermochimica Acta.The article was published on 1977-04-01. It has received 26 citations till now. The article focuses on the topics: Chemical ionization & Mass spectrometry.
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TL;DR: In this paper, the authors discuss the application of TG-MS in relation to the various factors affecting thermal stability of polymeric materials, thermoplastics, thermosets and elastomers.
85 citations
TL;DR: In this article, a combination of thermal analysis (TA) with gas-analykal techniques significantly enhances the possibilities for correctly interpreting the mechanism of thermally induced reactions, which involve the formation of gaseous species.
Abstract: INTRODUCTION Combining thermal analysis (TA) with gas-analykal techniques significantly enhances the possibilities for correctly interpreting the mechanism of thermally induced reactions, which involve the formation of gaseous species. Several techniques can be used for evolved gas analysis (EGA), ranging from simple, non-specific detection to the more elaborate multidimensional/multifunctional methods, such as gas chromatography (GC), infrared spectroscopy (IR) or mass spectrometry (MS), for gas detection and analysis [1]. While the GC methods were used as early as the 1960s [2], EGA by FTIR was described much later and was used for the analysis of pyrolytic and combustion products. Presently, there are several commercial FTIR systems available that can be coupled to a thermogravimetric analyzer (TGA), and a broad range of applications have been investigated by this important hyphenated technique [3].
52 citations
TL;DR: In this paper, a new type of instrument was designed and constructed to measure quantitatively the gas phase species evolving during thermal decompositions, which can be used for understanding the kinetics of thermal decomposition, determining the heats of formation and vaporization of high-temperature materials, and analyzing sample contaminants.
Abstract: A new type of instrument has been designed and constructed to measure quantitatively the gas phase species evolving during thermal decompositions. These measurements can be used for understanding the kinetics of thermal decomposition, determining the heats of formation and vaporization of high‐temperature materials, and analyzing sample contaminants. The new design allows measurements to be made on the same time scale as the rates of the reactions being studied, provides a universal detection technique to study a wide range of compounds, gives quantitative measurements of decomposition products, and minimizes interference from the instrument on the measurements. The instrument design is based on a unique combination of thermogravimetric analysis (TGA), differential thermal analysis (DTA), and modulated beam mass spectroscopy (MBMS) which are brought together into a symbiotic relationship through the use of differentially pumped vacuum systems, modulated molecular beam techniques, and computer control and ...
44 citations
TL;DR: In this article, thermogravimetry (TG) and mass spectrometry (MS) are combined to provide precise heating conditions and weight loss information and MS identifies volatiles evolved during the weight loss process.
36 citations
TL;DR: In this article, the authors present a method for thermique gazeuse par spectrometrie de masse, which can be used in a wide range of applications, e.g. this article.
36 citations
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69 citations
TL;DR: In this article, registrierende Vakuumthermowaage gestattet es, Gewichtsanderungen einer erhitzten Probe in Abhangigkeit von der Temperatur, dem Druck and der Atmosphare zu messen.
Abstract: Die registrierende Vakuumthermowaage gestattet es, Gewichtsanderungen einer erhitzten Probe in Abhangigkeit von der Temperatur, dem Druck und der Atmosphare zu messen. Empfindlichkeit der Waage, Temperaturanstieg des Ofens, Gasatmosphare und Vakuum sind in bestimmten Bereichen frei wahlbar. Anderungen im Aufbau der Apparatur und Erweiterungen der Mestechnik durch zusatzliche Baueinheiten erschliesen einen weiten Anwendungsbereich. Der Aufbau der Anlage, ihre Arbeitsweise sowie die Moglichkeiten und Grenzen der exakten Anwendung der Thermogravimetrie fur wissenschaftliche und technische Probleme werden aufgezeigt.
66 citations
60 citations
TL;DR: In this article, the infrared spectrum of sulfur trioxide was obtained under prism resolution in the gaseous state and in xenon matrices at liquid-nitrogen temperature, and a satisfactory vibrational assignment of the monomeric SO3 spectrum could be made on the basis of a simple D3h symmetry model.
Abstract: The infrared spectrum of sulfur trioxide was obtained under prism resolution in the gaseous state and in xenon matrices at liquid‐nitrogen temperature. In both cases a satisfactory vibrational assignment of the monomeric SO3 spectrum could be made on the basis of a simple D3h symmetry model. The observed gas phase fundamentals were v3(e′) = 1391, v4(e′) = 529, and v2(a2″) = 495 cm—1. The matrix fundamentals were essentially the same as those of the gas phase except that the v2(a2″) mode was shifted to 464 cm—1. A normal coordinate treatment of the SO3 molecule was carried out and potential constants were determined for both Urey‐Bradley and simplified valence force fields. Three weak absorption bands of S3O9 were also detected in the gas‐phase spectrum. From the temperature and pressure variation of the intensities of these bands it was estimated that for the trimerization reaction at 298°K, Kp was approximately 1 atm—2 and ΔH298° was approximately 30 kcal/mole of S3O9. The values of the thermodynamic properties of monomeric SO3 were computed for the ideal gaseous state using the rigid rotor harmonic oscillator approximation at 1 atm from 100° to 1500°K.
58 citations