Premium
Effects of the composition ratio, eosin addition, and γ irradiation on the dielectric properties of poly(vinyl alcohol)/glycogen blends
Author(s) -
Abd ElKader F. H.,
Gaafar S. A.,
Mahmoud K. H.,
Bannan S. I.,
Abd ElKader M. F. H.
Publication year - 2008
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.28566
Subject(s) - vinyl alcohol , dielectric , materials science , relaxation (psychology) , activation energy , glass transition , polymer chemistry , dielectric spectroscopy , eosin , polymer , analytical chemistry (journal) , chemistry , composite material , organic chemistry , electrochemistry , psychology , social psychology , optoelectronics , electrode , medicine , staining , pathology
The dielectric relaxation spectra of various poly(vinyl alcohol) (PVA)/glycogen blends and irradiated blend samples with 70 wt % PVA content that were undoped and doped with eosin were measured in extended temperature (30–160°C) and frequency (1 kHz to 1 MHz) ranges. Dielectric relaxation spectroscopy separates different molecular groups of a repeating unit of a polymer with respect to the rate of its orientation dynamics. In the high‐temperature range (>100°C), the σ relaxation, which is associated with the hopping motion of ions in the disordered structure of the biopolymeric material, can be measured. The electric dipole moment and the activation energy of the glass‐transition temperature relaxation process were calculated. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008