Dielectric spectroscopy on a PHBV bio-polymer

This article is focused on the characterization of dielectric properties such as permittivity, dissipation factor and conductivity. These materials are tested under Nitrogen (N₂) in a controlled temperature. The dielectric study of this PHBV, identified three main mechanisms of relaxations classed in order of increasing temperatures here after. Relaxation related to the orientation of the carbonyl groups deemed polar inducing a cooperative motion of methyl and ester groups in the amorphous regions, at T<;Tg (beta-type). Relaxation due to the mobility of entire chains and associated segments directly related to crossing the Tg (alpha-type). Relaxation of space charge accumulated at the interfaces of the amorphous and crystal regions, at Tg<;T<;Tm (MWS-type). Finally a mechanism of ionic conduction seems to settle above 60[°C] at 10[mHz].