The next
weight loss step for pure PANI and its blend films is found
in the range 180–380 _C, which is caused by the degradation
of Coulomb attraction between the sulphonic acid and PANI
backbone (NH+_ _ _SO_3 interaction between the PANI chain
and DBSA dopant), because the acid itself begins to evaporate
and degrade (Hosseini and Entezami, 2001).