Polyanilines thermogravimetric analysis

Figure 2c shows the thermogravimetric analysis (TGA) of the as-synthesized polyaniline under an Ar atmosphere. No decomposition was observed for polyaniline powders up to 400°C. For a doped polyaniline ES, the dopant usually leaves the sample at a temperature in the range 100-200 C, unless polymeric acids (for example, polyphosphoric acid) are used. 

Fig. 8.5 Thermogravimetric analysis of standard polyaniline, polyaniline with 10 wt% multiwall carbon nanotubes, polyaniline with 10 wt% tin oxide, and polyanihne after hydrogen sorption measurements...

Thermogravimetric analysis (TGA) has been used for characterizing the thermostability of polyaniline/ PE composite systems [41], The composite sample, prepared by in situ polymerization of polyanihne on a micropo-rous PE support, exhibited the kinetics of mass losses and thermal effects similar to pristine PE. The composite sample was thermally stable up to 250°C, showing a mass loss of no more than 3 to 4%. However, a gradual decrease in mass was observed beyond 255°C due to thermal destruction of both polyaniline and the PE support. The maximum mass loss was at about 470°C and a nearly non-distinguishable mass losses was seen from 500 to 800°C, where the carbonized residue was not more than 20% of the initial mass [41]. 

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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