Study of Molecular Dynamics in Poly(n-alkyl methacrylates) by Light Induced Absorption AnisotropyClick to copy article linkArticle link copied!
Abstract
![Abstract Image](/cms/10.1021/jp504276y/asset/images/medium/jp-2014-04276y_0009.gif)
Formation of absorbance anisotropy under linearly polarized irradiation at 405 nm in films of poly(ethyl methacrylate) (PEMA), poly(n-butyl methacrylate) (PnBMA), and poly(n-hexyl methacrylate) (PnHexMA) doped with azo compound has been studied in a wide temperature range below Tg. The anisotropy formation kinetics has been well described under the assumption that there are two types of environments in the polymer matrixes: mobile and immobile. The mobile environment allows the dopant to reorient in the course of cis–trans–cis isomerization cycle and the immobile environment does not. The fraction of mobile environments was estimated to be 0.12 in PEMA, 0.65 in PnBMA, and 1.0 in PnHexMA. An increase in the fraction of mobile environments within the series PEMA–PnBMA–PnHexMA have been associated with an increase in the size of alkyl nanodomains. The average angle of transition dipole rotation upon isomerization and the amplitude of molecules librations have been estimated in the temperature range studied.
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This article is cited by 4 publications.
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- S. Grebenkin, V. M. Syutkin. Isomerization and reorientation of Disperse Red 1 in poly(ethyl methacrylate). The Journal of Chemical Physics 2021, 155
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https://doi.org/10.1063/5.0063031
- Alexey Bobrovsky, Valery Shibaev, Alexey Piryazev, Denis V. Anokhin, Dimitri A. Ivanov, Olga Sinitsyna, Vera Hamplova, Miroslav Kaspar, Alexej Bubnov. Photo-Orientation Phenomena in Photochromic Liquid Crystalline Azobenzene-Containing Polymethacrylates with Different Spacer Length. Macromolecular Chemistry and Physics 2017, 218
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- S.Yu. Grebenkin, V.M. Syutkin, Denis S. Baranov. Mutual orientation of the n → π * and π → π * transition dipole moments in azo compounds: Determination by light-induced optical anisotropy. Journal of Photochemistry and Photobiology A: Chemistry 2017, 344 , 1-7. https://doi.org/10.1016/j.jphotochem.2017.04.031
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