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The electronic relaxation processes in poly(p-phenylene) (PPP) and poly(N-vinylcarbazole) (PVCA) were studied. The fractional thermostimulated luminescence gave evidence of two different thermoactivated processes in PPP and PVCA, taking place in different temperature regions. Fractional thermostimulated luminescence results have been discussed in terms of self-trapping of charge carriers. In PVCA the self-trapping of charge carriers proceeds via formation of dimer cation radicals. [ABSTRACT FROM AUTHOR]

Dynamic mechanical, dielectric, luminescent, and thermodynamic relaxation spectra of butadiene-styrene copolymers are compared. Dynamic mechanical results were obtained by torsion pendulum measurements, dielectric results by thermally stimulated depolarization current (TSDC) method. Thermostimulated luminescence (TSL) and differential thermal analysis (DTA) were used in the luminescence and thermodynamic cases, respectively. The variations of the relaxation spectra with the copolymer composition (block or statistical, styrene content, 1,4 or 1,2-addition butadiene) and, especially, the possibilities of the comparison of different relaxation spectra as a tool for analysis of the structural origin of the observed spectral peaks are discussed. [ABSTRACT FROM AUTHOR]