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Dielectric analysis of cellulose and its vinylic copolymers
Author(s) -
Flaqué C.,
Montserrat S.
Publication year - 1992
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.1992.070441108
Subject(s) - cellulose , copolymer , polymer chemistry , dielectric , relaxation (psychology) , side chain , materials science , methyl acrylate , chemistry , organic chemistry , polymer , composite material , psychology , social psychology , optoelectronics
The real and imaginary parts of the complex dielectric permittivity, ε′ and ε″, for some vinylic copolymers of cellulose [prepared with vinyl acetate (VA) and methyl acrylate (MA) and Ce (IV) ions as initiator ] and for cellulose were measured over a frequency band of 0.1–10 2 kHz and a temperature range from −40 to 100°C. In vinylic copolymers of cellulose, we observed one dielectric relaxation attributed to the α‐relaxation of the vinylic side chain grafted on cellulose. In cellulose dielectric spectra, this relaxation did not appear, but we detected one relaxation that may correspond to the β‐relaxation. For these vinylic copolymers of cellulose, the ε″ against ε′ plot gives a skewed are that closely resembles that of the Davidson–Cole model, with a broader distribution for high frequencies that shows the overlap of several relaxations in the process considered. Some differences observed between the vinylic copolymers of cellulose may be due to the composition and the length of the vinylic side chains and to the frequency of grafting on the cellulose.