Relationship between the Relative Dielectric Constant and the Monomer Sequence of Acrylonitrile in Rubber.

ABSTRACT: Acrylonitrile-butadiene rubbers (NBRs) have a lower glass transition temperature (T _g) and a higher dielectric constant than other rubbers. To understand how a low T _g and a high dielectric constant are compatible, we focused on the acrylonitrile (AN) monomer sequence in rubber and synthesized random and alternating copolymers to evaluate the effect of the sequence. The AN monomer sequence dependence of the relative dielectric constant was investigated by the C-N stretching vibration of the nitrile group through Fourier transform infrared spectroscopy and internal rotation potential energy measurements around the C-C bond within the nitrile group based on dimer model calculations. The alternating copolymers, including NBR, showed a higher dielectric cons

SUBMITTER: Matsuno R 

PROVIDER: S-EPMC7346247 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature