Optimizing the performance of electrically poled polymeric films

Abstract

In this paper organic guest host system using 2-methyl-4-nitro aniline (2-MNA) as guest material and polyether sulfone (PES) as host material is considered for analysis. Thin and transparent film samples are prepared by using different concentration of 2-MNA. To align 2-MNA molecules in the electric field direction within polymer matrix, the films are poled for half an hour by contact electrode poling technique. Conductance and dissipation factor of films are measured at room temperature by Agilent Impedance Analyzer after poling the films. Wide frequency ranges varying from 100Hz to 10M Hz are kept for optimization. The effects of chromophoric group (2-MNA) concentration on the electrical conductance and dissipation factor is analyzed. The behavior of conductance and dielectric loss are optimized mathematically using FMINCON (a MATLAB tool) and multiobjective differential evolution algorithm (MODEA). To optimize the relation of conductance and dissipation factor with doping concentration of 2-MNA and applied frequency, the measured data is also modeled taking conductance and dissipation factor of films as dependent variable, which are affected by two independent variables namely frequency and dose of 2-MNA. The statistical validity and predictive capability of the obtained models is also checked by determining absolute average deviation and coefficients of determination.