Pressure dependence of the dielectric loss in semi-conducting polypyrrole aged at room temperature

TL;DR

This study investigates how two years of aging at room temperature affects the dielectric loss in semi-conducting polypyrrole under different pressures, revealing structural changes impacting relaxation behavior.

Contribution

It provides new insights into the effects of physical aging on dielectric properties and activation volume in polypyrrole, highlighting structural modifications over time.

Findings

Dielectric loss spectra change with aging and pressure.

Activation volume for relaxation decreases after aging.

Structural modifications include chain segmentation and grain size reduction.

Abstract

The effect of physical aging of semi-conducting polypyrrole at ambient temperature for two years duration on the dielectric loss at various pressures is investigated. Changes of the dielectric loss spectra and the modification of the values of the activation volume for relaxation are interpreted through the division of chain clusters into smaller components and the reduction of the size of the conductive grains.