Influence of Nanoparticles on the Dielectric Response of a Single Component Resin Based on Polyesterimide

The influence of various types of nanoparticle fillers with the same diameter of 20 nm were separately incorporated into a single component impregnating resin based on a polyesterimide (PEI) matrix and its subsequent changes in complex relative permittivity were studied. In this paper, nanoparticles of Al2O3 and ZnO were dispersed into PEI (with 0.5 and 1 wt.%) to prepare nanocomposite polymer. Dielectric frequency spectroscopy was used to measure the dependence of the real and imaginary parts of complex relative permittivity within the frequency range of 1 mHz to 1 MHz at a temperature range from +20 degrees C to +120 degrees C. The presence of weight concentration of nanoparticles in the PEI resin has an impact on the segmental dynamics of the polymer chain and changed the charge distribution in the given system. The changes detected in the H-1 NMR spectra confirm that dispersed nanoparticles in PEI lead to the formation of loose structures, which results in higher polymer chain mobility. A shift of the local relaxation peaks, corresponding to the alpha-relaxation process, and higher mobility of the polymer chains in the spectra of imaginary permittivity of the investigated nanocomposites was observed.

Automated summary

In this study, nanoparticles of Al2O3 and ZnO were dispersed into a polyesterimide (PEI) matrix to prepare nanocomposite polymer. The influence of nanoparticle fillers on the complex relative permittivity was studied using dielectric frequency spectroscopy. The presence of nanoparticles in the resin changed the segmental dynamics of the polymer chain and charge distribution, resulting in higher polymer chain mobility and a shift of relaxation peaks in the spectra.