Differential thermogravimetric DTG curves

The DTG curves of as-synthesized samples (11-IV) are shown in Fig. 5. At least three distinguishable peaks are observed in the differential thermogravimetric (DTG) curves. Those are supposed to be related with water and MTAB cations interacted with silicate species and TPA cations trapped in the channels of silicate-1, respectively. There are four distinct stages of weight loss in the DTG data shown 23-150°C (due to the desorption of... 

A differential thermogravimetric (DTG) curve shows that PIF had two weight-loss peaks. It is believed that the first weight loss peak in DTG of PIF, which ranges from 485.42 to 621.23 °C, was associated with fluorine. To systematically study the thermal degradation mechanism of PIF, high resolution Py-GC-MS was used. The total ion chromatograms at 740 °C show that PIF produced trifluoromethane and phenyltrifluoromethane. It is concluded that the C-C bond of CF3-C-CF3 in PIF was... 

The thermal degradation behavior of the block copolymers obtained was studied thermogravimetrically. As a typical example, TG and differential thermogravimetric (DTG) curves of the block copolymer from the poly(NMAAm)/EA system are shown in Fig. 28, together with those of poly(NMAAm) and poly(EA). The block copolymer decomposed at a higher temperature than poly(NMAAm), despite the fact that the former contains a poly(NMAAm) block. Similar behavior was observed in other copolymers. This phenomenon may be rationalized as follows. As already mentioned, the prepolymerization of NMAAm in benzene yields microspheres of poly(NMAAm)... 

FIGURE 1.191 Thermogravimetric (TG) and differential TG (DTG) curves of weight loss on heating of initial silica (curves 1) and water-wetted MCA-sample treated for 6 h (curves 2). (Adapted from J. Colloid Interface Sci., 355, Gun ko, V.M., Voronin, E.F., Nosach, L.V. et al., Structural, textural and adsorption characteristics of nanosilica mechanochemically activated in different media, 300-311, 2011e. Copyright 2011, with permission from Elsevier.)... 

Temperature programmed oxidation (TPO) tests were also performed for the two series of catalysts and their respective supports by registering the sample weight during the thermal process. The analysis of those curves not only allowed accurate determination of the metal loading in the samples (Table 12.1), but also provided some structural information related to the ability of the Pt surface to catalyze the oxidation of the carbon at its periphery. The differential thermogravimetric (DTG) profiles obtained (Figure 12.18) show how the presence... 

FIGURE 12.18 Differential thermogravimetric analysis curves during the temperature programmed oxidation (DTG-TPO) of the Pt/CB catalysts (a) and their supports (b). Heating rate 25Kmin . ... 

Figure 2. Thermogravimetric and differential thermogravimetric curves (TG and DTG) of melamine, heating rate 10 C/min nitrogen, 60 cm3/min.

Figure 20.1 show as an example the thermogravimetric crave (TG) obtained for the natural ilhte. A continuous weight loss can be seen between 150°C and 980°C the differential thermogravimetric curve (DTG) showing two endothermic effects. The first one is centered at 150°C which corresponds to loss of ilhte water. The second one is centered about 580°C and is mainly associated to the loss of stractural water. 

Thermogravimetric (TG) measurements were performed with a Derivatograph-C (MOM, Budapest) type apparatus. The TG, its derivative (DTG) and differential thermal analysis curves characterising the samples were drawn. The heating rate was 5 °C min , and the measurements were carried out between 25 and 150 °C with linear heating. The weight of the samples was 50 0.1 mg. 

The results of a TGA measurement are usually displayed as a TGA curve in which mass or per cent mass is plotted against temperatirre and/or time. An alternative and complementary presentation is to use the first derivative of the TGA curve with respect to temperature or time. This shows the rate at which the mass changes and is known as the differential thermogravimetric or DTG curve. 

The results of thermogravimetric studies of produced samples, namely individual nano-Ti02-5 and polyaniline, and its composite are shown on the Fig5. 7-8 and in Table 3. The eharacter of obtained curves of mass loss Am (TG), differential eurves of mass loss (DTG) and difFeiential thermal analysis (DTA) are different eonsiderably (Fig. 8). 

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