Thermogravimetry curves

Thermogravimetry Curves of Bromocriptine Mesilate, each at a heating rate of 20 C/min. and a Nitrogen Flow of 15 ml/min. 

Figure 14 shows typical differential thermometry and thermogravimetry curves (DTA and TGA) of DSP and crystalline poly-DSP in a helium current64. ... 

List some of the factors that influence (a) thermogravimetry curves, (b) differential thermal analysis curves, and (c) differential scanning calorimetry curves, indicating which are most important for the various techniques. 

Fig. 5.20 Thermogravimetrie curves for the two C-S-H gel samples prepared in the isobaric conditions, (according to [41])...

The formation of volatile degradation products as observed by non-isothermal thermogravimetry is a complex process. The non-isothermal thermogravimetry curve that is apparently composed of several independent processes was described by the first-order scheme, i.e. — = km where t is time, m is the actual mass of the degraded sample, and k is the rate constant of polyolefin degradation to volatile products. In a non-isothermal mode,... 

Figure 3. Thermogravimetry curves recorded on a commercial polycarbosilane (Dow Corning X9-6348) in Ar flow (lOOcm min ) at different heating rates.

Pig- 4-159 Simulated Distillation by Thermogravimetry Curve 1 n-Hexacontane Curve 2 n-Hexylpyrene Cuive 3 Vacuum Residue... 

The pyrolysis of these substituted PS gives monomer as the main product for all polymers (60-80 wt%). The other distribution of products supports the view that the thermodestruction of these polymers starts from a random chain scission. The main process for all substituted PS is depolymerisation, similar to unsubstituted PS. In the case of p(2f(2-substituted PS a good linear dependence was found between thermogravimetry curve and the Hammett constants of the substituents (Tffi = 403.5 - 67.487 ox). The results indicate that the Hammett relationship can describe quantitatively the trends in T and thus thermostability of substituted PS and that thermostability of these polymers depends only on the electronic nature of substituents and their possibility to stabilise macroradicals forming on chain scission. 

Thermogravimetry curve Graphical representation of data collected by a thermobalance, where the mass change is plotted as a function of temperature (scanning mode) or time (isothermal mode). 

An analysis of praseodymium dioxide, also called praseodymium(IV) oxide, in a variety of atmospheres is shown in Fig. 7.8. The measurements were carried out with a Mettler Thermoanalyzer as described in Fig. 7,2. The furnace arrangement was similar to the one shown in the bottom right diagram of Fig. 7.3. The heating rate was 8 K/min, the gas flow was about 10 liter/h at atmospheric pressure, and the sample mass was about 3 g of black Pr02. The thermogravimetry curves of Fig. 7.8 are recalculated in terms of the chemical composition of the praseodymium oxides. 

C with a heating rate of lO C/min under a N2 atmosphere. The measurements were eonducted using 6-10 mg samples. Thermogravimetrie curves were reeorded. 

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