Dielectric spectroscopy of thermoplastic polyimide R-SOD in the region of medium and high temperatures

Abstract

Abstract Molecular mobility and charge transport in R-SOD aromatic thermoplastic polyimide were studied by dielectric method. Dielectric spectra of all samples in the examined temperature and frequency range revealed two regions of dipole polarization relaxation. The β- process is determined by local motion of the phenyl rings in the diamine and dianhydride moieties of the macromolecule with the adjacent groups. The α-process can be associated with crossing the glass transition temperature, i.e., with the segmental large-scale mobility of the main chains. The introduction of nano-additives (R-SOD 3%) does not change the relaxation times in the regions of β and α process, but leads to an increase in intensity compared to pure polyimide R-SOD.