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- W2046989364 abstract "A guest-host polymer system with potential use in electro-optic devices is discussed. The polymer host is a high Tg, fully aromatic polyimide and the guest chromophore is disperse red 19. Relaxation mechanisms of polar order after electric field alignment procedure have been investigated by measuring the isothermal decay of the macroscopic nonlinear optical coefficient d333 at different temperatures below glass transition temperature (Tg), upon the removal of the poling electric field. All the decay curves can be fitted by a double exponential function. Below Tg, the slower relaxation time shows an Arrhenius temperature dependence. An extrapolation to room temperature allows to predict the time stability which results to be longer than 30years. In addition, absorption spectra measurements of the films were performed before and immediately after poling procedure to estimate independently the polar order of the dipoles through the decrease of the absorption coefficients." @default.
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- W2046989364 date "2007-01-15" @default.
- W2046989364 modified "2023-09-25" @default.
- W2046989364 title "Order relaxation of a poled azo dye in a high Tg, fully aromatic polyimide" @default.
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- W2046989364 doi "https://doi.org/10.1063/1.2422712" @default.
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