Abstract
UV-curable polyurethane acrylate prepolymers were prepared from diisocyanates [isophorone diisocyanate (IPDI), 2,4-toluene diisocyanate (TDI), or 4,4′-dicyclohexylmethane diisocyanate (H12MDI)], diols [ethylene glycol (EG), 1,4-butane diol (BD), or 1,6-hexane diol (HD)], polypropylene glycol as a polyol. UV-curable mixtures were formulated from the prepolymer (90 wt%), reactive diluent monomer trimethylol propane triacrylate (10 wt%), and photoinitiator 1-hydroxycyclohexyl ketone (3 wt% based on prepolymer/diluent). The effects of different diisocyanates/low molecular weigh diol on the dynamic mechanical thermal properties and elastic recovery of UV-cured polyurethane acrylate films were examined. The tensile storage modulus increased a little in the order of EG>BD>HD at the same diisocyanate. Two loss modulus peaks for all samples are observed owing to the glass transition of soft segments (T gs ) and the glass transition temperature of hard segments (T gh ). For the same diisocyanate,T gs decreased, however,T gh increased, in the order of HD>BD>EG. The elastic recovery also increased in the order of HD>BD>EG at the same diisocyanate. In case of same diols,T gh increased in the order of H12MDI>TDI>IPDI significantly. The ultimate elongation and elastic recovery increased in the order of TDI>IPDI>H12MDI at the same diol.
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Yoo, HJ., Lee, YH., Kwon, JY. et al. Comparision of the properties of UV-cured polyurethane acrylates containing different diisocyanates and low molecular weight diols. Fibers Polym 2, 122–128 (2001). https://doi.org/10.1007/BF02875324
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DOI: https://doi.org/10.1007/BF02875324