The spectral and polarization characteristics of optically anisotropic polyvinyl alcohol (PVA) films containing 4,4'-bis[4-(phenylamino)-6-(methoxy-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid as dichroic dye, which has intense blue fluorescence, were investigated by polarized luminescence and absorptionspectroscopy in the IR and UV regions. With fourfold uniaxial stretching of the film the orientation parameter of the dye amounts to 0.82–0.86, the maximum polarizing ability of the film is 96% (at the maximum of the absorption band at 375 nm), and the degree of polarization and quantum yield of fluorescence at the optimum concentration of the dye amount to 0.90 and 0.91. The degree of orientation of the dye molecules depends weakly on the concentration (0.01–0.50 wt.%) and increases with increase of the uniaxial stretching of the film. The insertion of the dye molecules between the PVA chains leads to a reduction of the crystallinity of the polymeric matrix.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 83, No. 4, pp. 652–656, July–August, 2016.
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Bondarev, S.L., Ariko, N.G., Filippovich, L.N. et al. Spectral and Polarizing Properties of Anisotropic Films Based on Polyvinyl Alcohol and 4,4′-Bis[4-(Phenylamino)-6-(Methoxy-1,3,5-Triazin-2-YL) Amino]Stilbene-2,2′-Disulfonic Acid. J Appl Spectrosc 83, 661–664 (2016). https://doi.org/10.1007/s10812-016-0344-8
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DOI: https://doi.org/10.1007/s10812-016-0344-8