Features of Polarization Processes in Thin Films Poly(Diphenylene Phthalide)

Abstract:

The paper presents the results of investigation of polarization processes in poly (diphenylene phthalide) films in a wide frequency range (10-1-106Hz) and temperatures (273-373K). The thickness of the films varied from 5 μm to 100 μm. An increase in the dielectric constant, which may be associated with the manifestation of the dipole-relaxation polarization mechanism, is observed. The temperature dependence of the loss factor for the investigated PDF films revealed a relaxation maximum in the studied temperature region. This anomaly is caused by relaxation processes in the polymer structure. The frequency dependence of the conductivity was σ'~ω^s type, that indicates the existence of hopping mechanism of charge transfer. The values of the exponent was s<1.0 and decreased with the increase of temperature. The observed linear dependence of the temperature of change in the conductivity type on the film thickness may be associated with transition of the polymer system from the dielectric to conducting state. This feature can be used to estimate the sample thickness for this system.

• Periodical: Key Engineering Materials (Volume 744)
• Pages: 350-353
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.744.350
• Online since: July 2017
• Authors: Rene Alejandro Castro*, Aleksei A. Kononov
• Keywords: Conductivity, Dielectric Losses, Dielectric Method, Polarization Processes

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