Thermogravimetric curves, differential

Figure 7 Thermogravimetric and differential thermogravimetric curves of NBR and HNBR. Source Ref. 134.

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. 

Figure 4. Thermo gravimetric and differential thermogravimetric curves of the asphaltenes (Cs) from a 525+ ° C Oficina residue...

FIGURE 7.71 (a) Weight loss and (b) differential thermogravimetric curves for HGA and individual BSA,... 

FIGURE 12.21 Differential thermogravimetric curves for high surface area graphite (G3) and their supported catalysts (PtG3-a and PtG3-c) in N2/O2 atmosphere. 

Fig. 14. Differential Thermogravimetric Analyses of Ethylene-Vinyl Acetate. ZB - Zinc Borate, ATH - Alumina Trihydrate. Zero values for the ordinates of success curves are at about 10%/min. intervals.

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... 

FIGURE 6 Thermogravimetric and differential thermal analysis results from a granulation blend of a hydrated API. The thermogravimetric curve is dotted the differential thermal analysis curve is solid the derivative of the thermogravimetric curve is dashed. 

The differential thermogravimetric analysis (DTGA) curves in Figure 3.2 show that for polyformaldehyde decomposition in an inert atmosphere at 170 C, its maximal rate is achieved at 200 C, while its second maximum is at 209 C. Acetylation of polyformaldehyde enhances its thermal stability the first maximum on the DTGA curves is now at 250 G, while the second is at 285 G. This effect is associated with the fact that polyformaldehyde readily decomposes to monomer because of the presence of polar C-O bonds and OH groups ... 

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... 

Thermogravimetric curves of the studied samples have rather complex character because of overlaying different processes against each other, as the differential thermal analysis (DTA) is poorly informative. The carbon rest of samples approximately on 30% exceed maintenance Si02 in samples. Most likely the thermal thermal-oxidative destruction of the polymers, accompanied also allocation of low-molecular siliceous products mainly proceeds (Table 8). 

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)... 

H. Anderson [11] used differential thermal and thermogravimetric analyses to confirm the free radical mechanism of the thermal decomposition of epoxide resins, proposed by M. B. Neiman and associates. It was shown in this work that an important stj e in the pyrolysis of an epoxide resin is isomerization of the epoxide group to a carbonyl, which is accompanied by an exothermic effect and is observed in the temperature interval 350-400°C. The thermogravimetric curves confirmed that the rate of pyrolysis of samples of epoxide resins hardened with maleic anhydride is less than that of samples hardened with amines (metaphenylenediamine). 

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... 

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