2020 (2) 4

https://doi.org/10.15407/polymerj.42.02.104

SOLVENT EFFECTS ON PHOTOPHYSICAL PROPERTIES OF ORGANIC DYES IN THE POLYMER MATRIX

T.V. Bezrodna,

Institute of Physics NAS of Ukraine, 46, Nauki av., Kyiv, 03680 Ukraine

V.I. Bezrodnyi,

Institute of Physics NAS of Ukraine, 46, Nauki av., Kyiv, 03680, Ukraine

A.M. Negriyko,

Institute of Physics NAS of Ukraine, 46, Nauki av., Kyiv, 03680, Ukraine

L.F. Kosyanchuk,

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

e-mail: lkosyanchuk@ukr.net

ORCID: 0000-0002-3617-9538

O.I. Antonenko,

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

O.O. Brovko

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

e-mail: brovko@nas.gov.ua

ORCID: 0000-0003-0238-1137

Polym. J., 2020, 42, no. 2: 104-113.

Section: Physics of polymers.

Language: Russian.

Abstract:

Effects of the solvents, different by physical parameters, on the association processes and spectral properties of organic dyes, doped to the polymer matrix have been investigated. The polyurethane acrylate (PUA) media with the xanthene dyes have been studied; the conditions for the dye associate formation have been determined by means of optical spectroscopy. Widely used organic compounds, namely, Rhodamine 6G (Rh6G) and Rhodamine (RhB), with efficient spontaneous and stimulated emission in liquid and solid-state solutions have been chosen as laser dyes. The absorption spectral curves of the dye polymer solutions allowed to analyze the aggregation degree of the Rh6G and RhB molecules in PUA. Monotonous growth in the ratio of absorption cross-sections for the monomer and dimer forms has been observed with an increase of the solvent dielectric permeability. The solvent effects the spectral characteristics of the xanthene dyes even after its total removal from the polymer mixture. The increase of solvent polarity results in the bathochromic shifts of luminescence maxima, growth of the Stokes shifts, and also in a decrease of the Rh6G and RhB dye destruction degree during the process of the PUA radical photopolymerization. Despite low polar characteristics of the PUA and removal of the solvents from oligourethane acrylate on a stage of the production, the dye molecules remain solvated by the negligibly small traces of solvents. The distribution homogeneity of dye monomer molecules in the polymer media plays also an important role. To provide high amplification coefficients for the polymer-based active media and considerable predominance of the monomer quantity over the dimers in the case of the xanthene dyes, the solvents of high polarity have been shown to be used in the synthesis process. The use of these solvents provides.

Key words: dye, polymer, radical photopolymerization.

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