The 3rd and 4th degradation temperatures are found
to increase from D1 to D4 and then to decrease; these results
indicate that the blending process increases the stability of
the polymer blend until D4. In all cases, the final residue after
TGA is approximately 30% of the weight. This result indicates
that each blend forms a similar residue irrespective of the
PANI content. The PANI-DBSA salts were not completely
destroyed, because in nitrogen atmosphere, carbonisation of
polymer takes place leaving a marked residue.