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T. F. Samoilenko, L. M. Yashchenko, N. V. Yarova, L. O. Vorontsova, V. I. Shtompel, and O. O. Brovko
Impact of Accelerated Ageing on the Properties of Optically Transparent Nanostructured Ti-Containing Epoxyurethane
0313–0329 (2023)

PACS numbers: 42.70.Km, 61.05.cp, 78.30.Jw, 78.67.Sc, 81.07.Pr, 81.20.Fw, 81.70.Pg

Organic–inorganic hybrid materials are synthesized on the base of anhydride-cured epoxyurethane polymer matrix with an ultra-low content of poly(titanium oxide) nanoparticles (0.005 and 0.020 wt.% for TiO2) obtained in situ by the sol–gel method in polyoxypropylene glycol medium. The structure of the formed optically transparent samples was confirmed by the methods of optical microscopy and wide-angle x-ray scattering. As shown, TiO2 reveals itself as an amorphous phase and does not form aggregates of large size (> 200 nm). The behaviour of the neat epoxyurethane and of titanium-containing ones is studied under artificially accelerated weathering conditions in a climate chamber. The changes in the properties of films after exposure to UV radiation, elevated temperature and relative humidity are investigated by the methods of IR spectroscopy, hydrostatic weighting, differential scanning calorimetry, thermogravimetric analysis, and spectrophotometry. As found, under the influence of such climatic factors, the chemical structure of the samples changes insignificantly that proves their atmospheric stability. The increase in density and initial temperatures of thermal decomposition as well as the decrease in the increment of heat capacity (ΔCp) of epoxyurethanes indicate the proceeding of cross-linking reactions via condensation of hydroxyl groups in the conditions of the climate chamber, which lead to the formation of a denser structure. After accelerated weathering test, the optical transmission coefficient of all the samples diminishes slightly, but the loss of transparency decreases with increasing content of poly(titanium oxide) (18.2% for the neat epoxyurethane polymer and 11.6% for the sample with 0.020 wt.% TiO2). In general, modified epoxyurethanes have a higher resistance to degradation compared to the unmodified ones that is an evidence of the exhibiting of the UV-shielding properties of TiO2 and the simultaneous absence of its photocatalytic activity, which, on the contrary, would provoke the destruction of the polymer matrix under UV-irradiation.

Key words: epoxyurethanes, poly(titanium oxide), sol–gel synthesis, accelerated weathering, UV shielding, photocatalytic activity.

https://doi.org/10.15407/nnn.21.02.313

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