The reason for this behaviour might be that at a
PANI content less than 5%, the PANI is dispersed in the form
of separate islands in the PVA matrix, thereby enhancing the
strength of the blend. Beyond this concentration of 5%
PANI, the PANI forms globular aggregates in the matrix, thus
reducing the tensile strength (Jeeevananda and Siddaramaiah,
2003; Soares and Leyva, 2007). However, the elongation of the
blend films, decreases steadily with increases in the PANI content
in the blend because of the rigid or brittle nature of PANI.