Thermogravimetry and differential

Fig. 7. Thermogravimetry and differential scanning calorimetry curves for corn cob xylan (Unpublished data).

This paper reviews recycling technologies of PMMA waste, its applications and its markets. It relates in detail experimentation on thermal and oxidative depolymerisation of PMMA scrap, under nitrogen and oxygen atmospheres, at different heating rates by thermogravimetry and differential scanning calorimetry techniques. 15 refs. 

The research papers which originated in the last couple of years in different countries in this field indicate that ED and Er are not generally reported and there is an emphasis on the study of comprehensive thermal behavior of explosives as a function of temperature or time by means of different thermal analytical techniques. Most commonly used methods of thermal analysis are differential thermal analysis (DTA), thermogravimetric analysis (TGA) or thermogravimetry and differential scanning calorimetry (DSC). 

Thermal decomposition kinetics of complexes have been studied by thermogravimetry and differential thermal analysis in order to understand the thermal stability and the mechanism... 

The stability of the polyyne-type polymers can be examined by thermogravimetry and differential thermal analysis (TG/DTA). From the DTA curves in Figure 10.5, an exothermic peak is observed in all cases. The very broad peak for PpPE is observed around at 350°C, while the sharp peak is observed at 207°C for PpPB and at 138 C for PpPO, respectively. The exothermic peak temperature should be related with thermal stability of the polyyne-type polymers, thus it is concluded that the most stable is PpPE... 

Variable temperature spectroscopy is a valuable tool for monitoring changes in the sample during heating and allows phases identified by thermal techniques, such as thermogravimetry and differential scanning calorimetry (DSC) to be identified, in particular those that are unstable at ambient conditions. 

Vossoughi, S. et al. Study of the Clay Effect on Crude Oil Combustion by Thermogravimetry and Differential Scanning Calorimetry. J. Thermal Analysis 11 (1983) p. 17-36. 

The monograph Thermal Methods in Petroleum Analysis is based mainly on results of more than twelve years research work on the application of thermoanalytical methods to petroleum and its products during the activities of the author at the German Institute for Petroleum Research. It was very interesting to research the application of well defined physical methods, such as thermogravimetry and differential scanning calorimetry, to the multicomponent systems of petroleum and its products, and to understand the limits of those methods on the one hand and the excellent transferability of the results to technical processes on the other. The diversity of possible applications of thermoanalytical methods to various problems in the petroleum laboratory can only be indicated in this monograph. 

Seiko T(5 T(3/DTA300 Thermogravimetry and Differential Thermal Analyzer... 

Two thermal methods have been extensively studied in recent years, pyrolysis-gas chromatography (Py-GC) - mass spectrometry (MS) and evolved gas analysis involving infrared spectroscopy (IR) - MS, thermogravimetry and differential scanning calorimetry (DSC). 

Penchev, V., and Stojanova, M. A., Study of the Heavy Fractions and Residues from West Siberian Crude Oil by Thermogravimetry and Differential Thermal Analysis, J. Thermal Analysis, 35 35-45 (1989)... 

The main parameters of thermal analysis, which are analyzed using the techniques of thermogravimetry and differential scanning calorimetry (DSC) are the degradation starting temperature or crystallization temperature (T) and melting temperature (T ). In Table 13.6 some values of these thermal parameters for PHB and PHBV and its composites with nanoceUulose are presented. 

Being dynamic techniques, both thermogravimetry and differential thermal analysis depend much on careful selection of apparatus and on reproducibility of technique (Mackenzie and Mitchell [1957, 1970a, 1970b] Mackenzie [1946b] Coats and Redfern [1963]). Some consideration of both aspects is necessary before considering the thermal reactions of individual minerals in order to assess what can and what cannot be determined under specific conditions. 

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