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• W1967725208 abstract "Abstract Second harmonic generation (SHG) is used to monitor the reorientation a dopant chromophore in slightly entangled poly(methy1 methacrylate) (PMMA). The effect of charge and temperature on both the decay and the much less studied onset modes of SHG signal at temperatures above the glass transition has been examined. At variance with the theoretical predictions, it is shown that the onset and the decay times are not coincident. An isothermal experiment above the glass transition shows a lengthening of relaxation time of the decay mode due to successive poling process, which is ascribed to charge memory effects. In contrast, the latter do not affect the onset characteristic time. The effect of temperature above the glass transition on dopant rotation and polymer relaxations has been also examined. As temperature increases the relaxation times of both the onset and the decay modes decrease. If the surface charge and the charge memory effect are erased, the decay time compares quite well with the structural relaxation time. Differently, the onset time exhibits a partial decoupling." @default.
• W1967725208 created "2016-06-24" @default.
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• W1967725208 date "2009-09-01" @default.
• W1967725208 modified "2023-09-24" @default.
• W1967725208 title "Second harmonic generation studies of intrinsic and extrinsic relaxation dynamics in poly(methy1 methacrylate)" @default.
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• W1967725208 doi "https://doi.org/10.1016/j.jnoncrysol.2009.06.035" @default.
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