Dielectric relaxation, optical and structural characterizations of complex composite films based on polyethylene oxide doped by low concentration of iodine

Abstract

The dielectric relaxation, optical, chemical and structural characterizations of synthesized complex composite films based on polyethylene oxide (PEO) doped with low concentrations of iodine (I2) were investigated. XRD results show that all PEO films have a semi-crystalline nature. Increasing I2 concentrations up to 1.0% into PEO films decreases the crystallinity degree from 40.0% to 21.1%. In addition, the bandgap energy decreases from 4.42 to 3.68 eV, as I2 increases to 1.0%. The permittivity and conductivity relaxation processes are studied over the temperatures from 288 K up to 318 K using Havriliak–Negami relationship to investigate the relaxation times, dielectric strengths, and the electrical conductivities. The ionic concentrations dominate the relaxation time due to the favorable I−3-polymer clustering. The findings investigate the impact of I2 and its ions on the segmental dynamics of PEO chains and optical, optoelectronic, and dielectric properties of polymers complexation with the non-metallic element in native form.