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Studies on dielectric relaxation and ac conductivity of cellulose acetate hydrogen phthalate–poly (vinyl pyrrolidone) blend
Author(s) -
Rao Vijayalakshmi,
Ashokan P. V.,
Amar J. V.
Publication year - 2002
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.11074
Subject(s) - dielectric , materials science , conductivity , dielectric loss , polymer chemistry , relaxation (psychology) , vinyl acetate , glass transition , atmospheric temperature range , electrical resistivity and conductivity , cellulose acetate , polymer , analytical chemistry (journal) , composite material , cellulose , chemistry , thermodynamics , organic chemistry , copolymer , psychology , social psychology , physics , optoelectronics , electrical engineering , engineering
The dielectric constant, dielectric loss, and ac conductivity of polyblends of cellulose acetate hydrogen phthalate (CAP) and poly (vinyl pyrrolidone) (PVP) of different compositions were measured in the temperature range of 300–430 K and in the frequency range of 50 Hz–100 kHz. In the blends, the dielectric constant as well as the dielectric loss as a function of the temperature display a single peak corresponding to the glass transition temperature ( T g ) in the region between the T g values of the pure polymers. The T g values observed agree well with those values obtained from DSC. Dielectric studies show that CAP forms a miscible blend with PVP. Ac conductivity values were calculated from the dielectric data and the conduction mechanism is discussed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1702–1708, 2002