UV-curcd polyurelhancacrylic compositions as protective coalings of optical waveguides
Polimery 1993, No 8-9, 432
Studies concerned with an optimization of the synthesis of urethaneacrylic UV-cured resins intended for protective coatings of optical waveguides were presented. In their synthesis home-made oligoetherols (Polikol 1500, Rokopol D-2002 and Rokopol 330), toluylene diisocyanate (Izocyn T-80) as well as hydroxyethyl methacrylate, hydroxypropyl methacrylate and hydroxycthyl acrylate were used. Active diluents (butyl acrylate and 2-ethylhexyl acrylate or their mixtures) and 2,2-dimethoxy-2-phenylacetophcnonc as a photoinitiator were added to the thus-prepared urethaneacrylic digomers comprising polymerization active double bonds and these compositions were UV-irradiatcd in an oxygen-free atmosphere. IR spectra of the composition were characterized and some physicochemical and mechanical properties (density, viscosity, refractive index, gel content, glass transition temperature, Shore hardness, Young modulus, breaking stress, relative elongation at break, thermal resistance and water-vapour diffusion coefficient) before and after curing were determined. In the Laboratory of Optical Waveguides Technology of the UMCS University the utility of these compositions for protective soft coatings of light pipes was checked and confirmed under manufacturing conditions.
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