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.