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Effect of copolymerization with methacrylonitrile on the dielectric relaxation of polyacrylonitrile
Author(s) -
Gupta A. K.,
Singhal R. P.,
Bajaj P.,
Agarwal V. K.
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070280322
Subject(s) - polyacrylonitrile , methacrylonitrile , dielectric , copolymer , relaxation (psychology) , materials science , dielectric loss , glass transition , polymer chemistry , nitrile , atmospheric temperature range , permittivity , acrylonitrile , polarizability , amplitude , polymer , composite material , thermodynamics , chemistry , optics , organic chemistry , molecule , physics , psychology , optoelectronics , social psychology
Abstract Dielectric relaxation in the glass transition region of polyacrylonitrile (PAN), polymethacrylonitrile (PMAN), and their random copolymers containing 6–46 wt % MAN has been studied in the frequency range 10 2 –10 5 Hz and temperature range 40–160°C. Changes in the dielectric constant increment, relaxation temperature, and the loss peak amplitude with changing MAN content in the copolymers were observed. Dielectric constant increment and loss peak amplitude showed maxima around 6–12 wt % MAN content while the relaxation temperature increased continuously over the entire range. The results are discussed in terms of the possible structural differences arising from the effect of the introduction of MAN units on the dipolar interactions between the nitrile groups.