Thermogravimetric analysis limitations

Early devices fbr thermogravimetric analysis were limited in precision and convenience when compared with DTA or DSC equipment. Now devices for simultaneous DSC and TG are on the market which can operate at high temps in reactive atms permitting the simulation of high temp reactions on a micro scale. The use of TG for the study of reaction kinetics was described in Sect 5.3.3. An exptl study of the sublimation of ammonium perchlorate was published by Jacobs and Jones (Ref 25). Similar techniques should find application in the study of other propint systems. The product gases have been collected for further analysis using gas chromatography and mass spectrometry... 

Thermogravimetric analysis (TGA) demonstrated that these polymers showed limited thermal stability for these materials, with decomposition occurring at temperatures >130°C. This stability is thought to be related to the M-CNR bond. The Tg data ranged from 37° to 96°C. The X-ray powder diffraction (XRD) pattern data provided complementary information concerning morphology of the polymers, as summarized in Table 1. 

Berlin, A., and R. J. Robinson Thermogravimetric Analysis Temperature Limits and Rate of Heating. Anal. Chim. Acta 27, 50 (1962). 

It is known [1], that the intensive thermal degradation temperature Td characterizes the polymer s thermostability. As the characteristic of thermostability according to [2] limiting temperature is accepted at which chemical change of polymer reflected on its properties takes place. The thermostability is determined with the aid of thermogravimetric analysis (TGA). Hereafter under Td a sample of 5%-th mass loss temperature obtained in TGA testing will be understand. 

Thermogravimetric analysis (TGA) can be used in the analysis of solvent residues in rugs. TGA measures the change in sample weight with time and change in temperature. It allows both identification and quantification of solvents, with a quantification limit of 100 ppm [96]. 

The kinetics and mechanism of thermal decomposition have often been studied by methods such as thermogravimetric analysis (TGA), differential thermal analysis (DTA), pyrolysis gas chromatography, or - by means of small externally heated retorts, agitated vessel or fluidized bed reactors. The usefullness of the results of these studies is often limited because ... 

Before systematic kinetic experiments, the catalyst activation procediue was investigated by means of thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and in situ hydrogenation experiments. An advantageous activation temperature was searched for. Three different temperatures were selected, i.e. 170°C, 300°C and 400°C. Since the critical sintering tenperature of nickel is between 450-500°C, the highest temperature was limited to 400°C [16],... 

Well-established examples of binudear cobalt(III) complexes with carbonate bridges are very limited. Kremer and Mac-Coil confirmed the existence of the p-carbonato-bis(pentaamminecobalt(III)) complex, [(NH3)s Co(C03) Co(NH3)s] (originally prepared by Kranig by potentiometric titration, conductometric charge determi-, nation, visible, ultraviolet, and infrared spectra, behavior against ion exchange resin, counter-ion substitution, thermogravimetric analysis and differential thermal analysis. 

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