Dielectric relaxational behavior of poly(diitaconate)s containing cyclic rings in the side chain
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Date
2003
Journal Title
Journal ISSN
Volume Title
Publisher
WILEY
Abstract
Dielectric relaxations of several poly(diitaconate)s with cyclobutyl, cycloheptyl, and cyclooctyl groups in the side chain were investigated. The study was performed by determining the dielectric permittivity and loss, depending on the frequency and temperature. Dynamic dielectric measurements indicated several relaxations according to the chemical structure of the polymers. The dielectric behavior of these polymers was compared with those of poly(dicyclohexyl itaconate), previously reported. The a relaxations were analyzed with the Havriliak-Negami equation. Significant differences in the subglass relaxations were observed. A tentative explanation of the molecular origin of each absorption was proposed in terms of the number of carbon atoms of the ring and their conformational versatility. Strong conductive processes were observed in these polymers at low frequencies and high temperatures. (C) 2003 Wiley Periodicals, Inc.
Description
Keywords
dielectric relaxation, poly(dicyclobutyl itaconate), poly(dicycloheptyl itaconate), poly(dicyclooctyl itaconate), conductivity effects, subglass relaxation, conformational versatility, dielectric, cyclic rings, relaxations, VISCOELASTIC RELAXATIONS, METHYL, GLASS, POLY(DI-N-ALKYL, METHACRYLATE), ACID-ESTERS), ITACONATES), TRANSITIONS, VISCOSITY, POLYMERS