UV-cured polyurethane-acrylic compositions as hard external layers
Studies have been described on optimization of the synthesis of urethane-acrylic UV-cured resins intended for protective hard coatings of optical waveguides. Domestic oligoetherols, diethylene glycol, toluene diisocyanate (Izocyn T-80) and isophorone diisocyanate as well as hydroxyethyl and hydroxypropyl methacrylates were used for the syntheses. Active diluents (butyl acrylate, 2-ethylhexyl acrylate, and 1,4-butanediol acrylate or mixtures thereof) and 2,2-dimethoxy-2-phenylacetophenone as a photoinitiator were added to the urethane-acrylic oligomers having polymerization-active double bonds. These compositions were UV-irradiated in an oxygen-free atmosphere. IR spectra of the compositions were recorded and some physicochemical and mechanical properties (density, molecular weight, viscosity as a function of temperature, refractive index, gel content, glass transition temperature, Shore hardness, Young modulus, breaking stress, elongation at break, thermal resistance and water-vapor diffusion coefficient) were determined before and after curing. The Laboratory of Optical Waveguides Technology, UMCS University, has checked and confirmed the utility of these composities for title coatings. Particularly useful are compositions 4, 7 and 11 (see Table 2).
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