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Donor-acceptor interaction effects on dielectric relaxation of methacrylic polymers

V. E. MUSTEATA1,* , V. BARBOIU1

Affiliation

  1. „Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi 700487, Romania

Abstract

A series of methacrylic copolymers with various densities of donor-acceptor interactions was analyzed by means of Dielectric Relaxation Spectroscopy. Two dielectric relaxations, one in the temperature region of the glass-rubber transition, and the other in the glassy state, were observed. The influence of donor-acceptor interactions on the first relaxation was especially investigated. From the analysis of frequency dependent data, the Vogel temperature, the fraction of free volume and the relaxation time at the glass transition temperature were determined for each copolymer composition by assuming that the VFTH plots must be straight lines in the non-Arrhenius region starting from the glass transition temperature. A procedure to diminish the conductivity effects in temperature swept dielectric spectra is proposed..

Keywords

Donor-acceptor copolymers, Donor-acceptor interactions, Relaxation time, Glass transition.

Submitted at: Sept. 28, 2012
Accepted at: July 19, 2012

Citation

V. E. MUSTEATA, V. BARBOIU, Donor-acceptor interaction effects on dielectric relaxation of methacrylic polymers, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 7-8, pp. 678-684 (2012)