Absorption and desorption currents in polystyrene doped with DR1

TL;DR

This study investigates the electrical relaxation behavior of polystyrene doped with DR1 molecules through polarization and depolarization currents, revealing broad relaxation time distributions and optimal poling conditions for stable polarization.

Contribution

It demonstrates that doped polystyrene behaves as a linear electrical system below its glass transition temperature and characterizes its relaxation dynamics using absorption and desorption currents.

Findings

Superposition principle applies at temperatures below Tg.

Relaxation response is non-exponential with broad distribution.

Optimal poling conditions yield high, stable residual polarization.

Abstract

Isothermal polarization and depolarization currents in polystyrene doped with DR1 chromophore molecules have been measured and analyzed in order to study the electrical relaxation of the poled order in this guest-host system. It has been shown that the superposition principle is applicable to the polymer system under study at temperatures lower than the glass transition temperature indicating that the doped polystyrene can be considered electrically as a linear system with a negligible electric conductivity. It has been found that the response function is not the exponential one and characterized by a broad distribution of relaxation times. By comparing isothermal absorption and desorption currents, the practical information was obtained on the best poling conditions for getting high and stable residual polarization.