Open AccessDielectric spectroscopy of thermoplastic polyimide R-SOD in the region of medium and high temperatures
Author(s) -
T. Dao,
Н. И. Никонорова,
R. A. Castro
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1400/5/055039
Subject(s) - polyimide , dielectric , materials science , glass transition , relaxation (psychology) , dipole , macromolecule , thermoplastic , polymer chemistry , diamine , spectroscopy , polarization (electrochemistry) , analytical chemistry (journal) , composite material , chemistry , polymer , organic chemistry , optoelectronics , layer (electronics) , psychology , social psychology , biochemistry , physics , quantum mechanics
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.