Differential thermal analysis example results

In given work the possibilities enumerated above of varieties of thermal analysis used to reseai ch of solid solutions of hydrated diphosphates with diverse composition. So, for example, the results of differential-thermal analysis Zn Co j P O -SH O showed, that it steady in the time of heating on air to 333 K. A further rise of temperature in interval 333 - 725 K is accompanied with the masses loss, which takes place in two basic stages, registered on crooked TG by two clear degrees, attendant to removal 4,0 and 1,0 mole H O. On crooked DTA these stages dehydration registers by two endothermic effects. In interval 603 - 725 K on crooked DTA is observed an exothermal effect. 

TGA, Differential Thermal Analysis (DTA) and Differential Thermogravimetric Analysis (DTG) measurements have been employed to determine the number and nature of water molecules present in the POMs. The results of TGA show the presence of two types of water in POM compounds, namely water of crystalHza-tion and constitutional water molecules. The loss of the former usually occurs at temperatures below 443-473 K [141]. At temperatures exceeding 543 K for H3PM012O40 and 623 K for H3PW12O40, the constitutional water molecules (the acidic protons bound to the oxygens of the polyanion) are lost, according to the literature and for the acid forms [140]. For example the thermolysis of H3PM012O40 proceeds in two steps as schematized below ... 

As reviewed elsewhere, much of the early conflict in the differential thermal analysis (DTA) data on coals, can be resolved if allowance is made for the influence of the varying sample geometry and ambient atmosphere employed in these studies. While the mode of sample containment is certainly critical for all TA studies in general, the sensitivity of thermal behavior to this variable is extreme for coals, oil shales and oil sands. As an illustrative example, consider the results presented in Fig. 1 for... 

In the next three figures a short summary of the fusion behavior of some examples of polymers is given. In Fig. 4.31 a series of results for crystals of poly(oxymethylene) of various degrees of perfection are illustrated. Figure 4.31 A shows the differential thermal analysis curves on melting of extended chain crystals of poly(oxymethylene). These crystals are large, close to... 

An understanding of the complex physico-chemical phenomena associated with the formation and behavior of cementitious compounds is facilitated through the application of many different types of investigative methods. Techniques such as NMR, XRD, neutron activation analysis, atomic absorption spectroscopy, IR/UV spectroscopy, electron microscopy, surface area techniques, pore characterization, zeta potential, vis-cometry, thermal analysis, etc., have been used with some success. Of the thermal analysis techniques the Differential Thermal Analysis (DTA), Thermogravimetric Analysis (TG), Differential Scanning Calorimetry (DSC), and Conduction Calorimetric methods are more popularly used than others. They are more adaptable, easier to use, and yield important results in a short span of time. In this chapter the application of these techniques will be highlighted and some of the work reported utilizing other related methods will also be mentioned with typical examples. 

An explanation for the organization of the composite components units discussed above was found in the results of a thermal analysis. The examples of differential thermogravi-metric (DTG) curves for graphite oxide, HKUST-1 and their composites with various contents of GO are presented in Fig. 10.6. Since no significant weight loss was measured above 450 °C, only the temperature range between 30 °C and 450 °C is shown, even though the analyses were carried out up to 1000 °C. In the case of GO a peak at 100 °C... 

---