Relaxation Processes in Nonlinear Optical Polymer Films

Authors T.A. Revenyuk, S.N. Fedosov
Affiliations Department of Physics and Materials Science, Odessa National Academy of Food Technologies, 112 Kanatnaya Str., 65039, Odessa, Ukraine
Е-mail [email protected]
Issue Volume 2, Year 2010, Number 3
Dates Received 23.09.2010, in final form – 04.10.2010
Citation T.A. Revenyuk, S.N. Fedosov, J. Nano- Electron. Phys. 2 No3, 6 (2010)
PACS Number(s) 82.35.Ej, 82.32.Lr
Keywords Polystyrene, DR1, Nonlinear optical polymers, AC dielectric spectroscopy.
Annotation Dielectric properties of the guest-host polystyrene/DR1 system have been studied by the AC dielectric spectroscopy method at frequencies from 1 Hz to 0,5 MHz and by the thermally stimulated depolarization current (TSDC) method from – 160 to 0 °C. The relaxation peaks at infra-low frequencies from 10 – 5to 10–2 Hz were also calculated using the Hamon’s approximation. Three relaxation processes, namely, α, β and δ ones were identified from the TSDC peaks, while the ε''(f)dependence showed a non-Debye ρ-peak narrowing with temperature. The activation energy of the α-relaxation appeared to be 2,57 eV, while that of the γ-process was 0,52 eV. Temperature dependence of the relaxation time is agreed with the Williams-Landel-Ferry model. The ε''(f)peaks were fitted to Havriliak-Negami’s expression and the corresponding distribution parameters were obtained.

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