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The effect of the phenalenone dyes Ph510, Ph160 and Ph439 on the characteristics that determine the radiation resistance of polyurethane (PU) matrices in the active elements of solid-state lasers was analyzed. The experiments by the EPR method with a nitroxyl spin probe showed that changes in the dynamic characteristics of the considered PU materials in the presence of phenalenone dyes were small. Contrary to this, gas permeability of polymer matrices in the presence of various phenalenone dyes was observed to decrease or grow depending on the structure of the dye and polyurethane, as well as on the possibility of chemical interactions of the dye with polymer. The obtained results make it possible to choose such combinations of pairs "phenalenone dye-polyurethane", where the radiation resistance of the polymer matrix would be optimal.

molecular crystals and liquid crystals

Influence of phenalenone class dyes on characteristics that determine the radiation resistance of polyurethane matrices in active elements of solid-state lasers