Thermogravimetric thermogram

Figures 9.11(a) and (b) show, the thermogravimetric thermogram and the gas chromatogram obtained for PS foam, respectively. It is seen in Figure 9.11(b) that the thermally degraded products consist of a complex mixture of about 20 components. Sixteen of these components were readily identified by the HRMS, as listed in Table 9.14.

In this study, the thermal characteristics of self-doped polyanilines was investigated. It was suggested that additional H-bonding introduced into poly anilines by the presence of carboxylic acids might increase its thermal stability. However, thermogravimetric thermograms of the copolymers were identical to polyaniline. 

Figure 9 shows the TG thermogram of griseofulvin obtained with a DuPont Model 950 Thermogravimetric Analyzer. The thermogram shows no weight loss from ambient to about 200°C followed by weight loss due to sublimation. 

Fig. 4.22. Complementary thermogravimetric and DSC thermograms, showing loss of a volatile component and solid-solid conversion of some of the sample from the amorphous to the crystalline phase.

In the thermogram (Figure 11.2), which vividly illustrates the thermogravimetric evaluation of CaC204.H20, it is ensured that the weight of this product decreases in several stages, namely ... 

The thermal properties of benzoic acid were evaluated using simultaneous differential thermal analysis (DTA) and thermogravimetric analysis (TGA). This work was performed on a Shimadzu DT-30 Thermal Analyzer system, which was calibrated using indium standard. Using a heating rate of 10°C/min, the thermograms presented in Figure 3 were obtained. 

Figure 3. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) thermograms of benzoic acid.

The thermogravimetric (TG) as well as difference thermogravimetric (DTG) analysis data are summarized in Table IV. The thermograms of selected derivatives are presented in Figure 1. 

Figure 6.6 Thermogram of HMX-fS using differential thermal analysis and thermogravimetric analysis...

A Dupont Thermogravimetric Analyzer was used to obtains thermograms of the products. A heating rate of 20 degrees per minute and a gas flow rate of 70 ml/min was used. 

The thermogravimetric curves for cimetidine and cimetidine hydrochloride are shown in Figure 13 and 14, respectively. The curves show that the compounds are stable up to a temperature of approximately 175-185°C and then decompose. The thermograms were obtained at a heating rate of 10°C/minute. 

TG analysis of pantoprazole sodium was conducted obtained using a TA Instruments model 951 thermogravimetric analyzer system, calibrated using indium. The thermograms were carried out at a heating rate of 10°C/min, the sample size used ranged 5 to 10 mg, and the samples were heated over a temperature range of 50°C to 400°C. 

Thermo gravimetric Analyzer (TGA). A strain gauge is also used in a TGA (thermogravimetric analyzer), a commercial instrument that incorporates a strain gauge to record mass loss, an optional gas inlet (for H2, He, 02, N2, Ar), and a furnace to heat a small sample (50 mg) of material between room temperature and 1000°C the resulting thermogram (mass loss versus temperature) detects mass changes as small as 1 part in 104, and it is used to follow desorption of water or solvent and chemical decomposition. 

Fig. 10 shows the thermograms of cellulose in atmospheres of helium and of oxygen, obtained by Tang and Neill. In the helium atmosphere, there is an endothermic dip in the differential thermal analysis curve and a sharp loss of weight in the thermogravimetric analysis curve beginning at about 300°, which denote the pyrolytic reactions. In the oxygen atmosphere, instead of the endothermic dip, there is an exotherm due to oxidation of the pyrolysis products. 

Fig. 10. —Thermograms of Cellulose. [(A) Thermogravimetric analysis in helium (B) differential thermal analysis in oxygen (C) difiFerential thermal analysis in nitrogen.]...

Figure 2. Scheme of a thermogravimetrical apparatus equipped with magnetic suspension balance. Typical thermogram of the decomposition of Ca-Oxalate with reaction gas tinalysis by mass spectromety. 

The thermogravimetric curves of several europium compounds and tetracosane are shown in Figure 3. The thermograms of some of the tris rare earth thd chelates and the tetrakis zirconium compound are presented in Figure 4, and those of the tris fod chelates are shown in Figure 5. 

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