Furthermore,
the molecular interaction (e.g., hydrogen bonding) amongst
the acid, PVA and PANI is no longer effective at this stage;
therefore, a major weight loss takes place. With increase in
PANI concentration, this peak temperature increases due to
increase in number of interaction sites between PANI chain
and DBSA dopant. The fourth and final weight loss step lies
in the range between 380 and 480 _C (Basavaraja et al.,
2009; Hosseini and Entezami, 2005), as presented in Table 4.