Thermogravimetric analysis profile

The decomposition temperature is a direct measure of the thermal stability of the nanocomposite materials. The derivative thermogravimetric analysis profile (DTA) (the inset of Figure 12.6a) shows two decomposition temperatures Tn and 7 2) for all the P3HT nanocomposites. The third decomposition temperature (7 ) assigned to MWNTs is visible only in the PM-5 and PM-10 samples. Tn originates... 

Thermogravimetry (TG) or thermogravimetric analysis (TGA). In this technique, the mass of a sample is followed as a function of temperature or time. The amount and rate of mass change with temperature or time in a controlled atmosphere are obtained. Such information can tell us about thermal stability as well as the compositional profile of a variety of elastomers and polymers. It is an excellent quantitative technique but qualitatively there may be some doubt as to what material is lost during heating. 

A thermogravimetric analysis (TGA) profile of a typical alicyclic copolymer resist resin, poly(CBN-co-NBCA), is shown in Fig. 7.15. All of the alicyclic resist co-and terpolymers show similar TGA profiles. The deprotection temperature and decomposition temperature for the polymers are roughly 250°C and 400°C, respectively. At the deprotection temperature, roughly 25% weight loss associated with the deprotection event and corresponding to the loss of isobutylene and carbon... 

The residual moisture determined by the thermogravimetric analysis (RG) is given in Table 2. The temperature profile 2°C/min from 30 to 100°C is used as the example given in Figure 11. 

As shown in Table 2.1 there are thermoanalyti-cal techniques, such as thermogravimetric analysis (TGA) or temperature programmed pyrolysis (TPPy), in which slow heating profiles are taken... 

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... 

Polymer characterisation, stabilisation and degradation are very widely studied by Thermal Analysis (TA). Single techniques, such as thermogravimetric analysis (TG), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and dielectric thermal analysis (DETA) provide important information on the thermal behaviour of materials. However, to obtain a more complete profile of, say, polymer degradation gas analysis is required, particularly since all of the techniques listed give mainly physical information on the behaviour of materials. 

FIGURE 22 Thermogravimetric and differential thermal analysis profiles for Ca(CH3C00)2-H20. 

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