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Fibers and Polymers 2001, Vol.2, No.3, 141-147
Effect of Chemical Structure on the Properties of UV-cured
Polyurethane Acrylates Films
Ji-Yun Kwon, Hye-Jin Yoo, and Han-Do Kim*
Department of Textile Engneering, College of Engineering, Pusan National University, Pusan 609-735, Korea
(Received April 4, 2001; Revised May 25, 2001; Accepted May 31, 2001)
Abstract: The effect of compositions of isophorone diisocyanate (IPDI)/4,4'-diphenylmethane diisocyanate (MDI) and polypro-
pylene oxide diol (PPG, Mw: 3000)/1,4-butane diol (BD) on the properties of UV-cured polyurethane acrylate films based on
2-hydroxyethyl acrylate (HEA) was examined. UV-curable polyurethane acrylates were formulated from the prepolymer, tri-
methylol propane triacrylate (TMPTA) as a reactive diluent, and 1-hydroxycyclohexyl ketone (Irgacure 184) as a photoinitia-
tor. Dynamic mechanical thermal properties and elastic properties of UV-cured polyurethane acrylates was found to depend
on the chemical composition of IPDI/MDI and PPG/BD. As the BD content increased, the tensile storage modulus of all
series samples increased significantly. The storage modulus increased in the order of samples A (IPDI based samples)
> samples B (IPDI/MDI (7/3 molar ratio) based samples) > samples C (IPDI/MDI (5/5 molar ratio) based samples at the
same composition. Two distinct loss modulus peaks for all samples are observed owing to the soft segment glass transition
Δ
temperature (Tgs) and hard segment glass transition temperature (Tgh). The difference between Tgs and Tgh ( Tg) increases in
the order of A > B > C at the same composition. In cycle test, the initial onset strain (%) was found to decrease with increas-
ing BD content in PPG/BD and with increasin
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