Electrical Behavior of Polyurethane Derived from Polyols Synthesized with Glycerol, Phthalic Anhydride, and Oleic Acid

Velayutham, T.S. and Abd Majid, Wan Haliza and Gan, S.N. (2011) Electrical Behavior of Polyurethane Derived from Polyols Synthesized with Glycerol, Phthalic Anhydride, and Oleic Acid. Journal of Applied Polymer Science, 121 (3). pp. 1796-1803. ISSN 0021-8995

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Abstract

The direct current (DC) and alternating current (AC) conductivity of polyurethane (PUR) derived from polyols synthesized with glycerol, phthalic anhydride, and oleic acid were investigated in this article. The PUR was prepared by varying the oleic acid content in polyol (28, 40, and 65) and the NCO/OH ratio of the PUR was varied to 1.2, 1.4, and 1.6. The electrical conduction studied by measuring the dependence of current on the applied field and temperature. Electrical conductivity in PUR was expressed by Arrhenius relations and the activation energies were calculated. Moreover, hyperbolic sine function was used to determine the conduction mechanism in PUR. It's presumed that the conduction mechanism was assisted by ions for the PUR which were contributed by oleic acid due to dissociation of protons and highly polar urethane groups in PUR. Furthermore, the dielectric behaviors of the material have been measured at room temperature in the frequency range of 100 Hz to 40 MHz. The frequency-dependent conductivity of PUR materials has been analyzed using a Jonscher's power law expression and the plot exhibits the typical behavior of ionic materials, i.e., the DC plateau and the frequency dependent region. © 2011 Wiley Periodicals, Inc.

Item Type: Article
Uncontrolled Keywords: Coatings Electrical properties Oleic acid Polyols Polyurethane Acid content Alternating current Applied field Arrhenius relations B-y Ions Conduction Mechanism Dielectric behavior Direct current Electrical behaviors Electrical conduction Electrical conductivity Electrical property Frequency dependent Frequency dependent conductivity Frequency ranges Ionic materials NCO/OH ratio Phthalic anhydrides Power-law expression Room temperature Sine functions Activation energy DC power transmission Electric conductivity Glycerol Hyperbolic functions Materials properties Unsaturated fatty acids
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: miss munirah saadom
Date Deposited: 04 Jan 2013 16:02
Last Modified: 18 Mar 2019 02:03
URI: http://eprints.um.edu.my/id/eprint/5695

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