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4810062 
Journal Article 
Synthesis and Cured Film Properties of UV-Curable Caprolactone-Modified Urethane Acrylate Oligomers 
Kim, JY; Moon, BJ; Kang, DooW; Hwang, SHo 
2010 
34 
6 
574-578 
WOS:000284988900015 
In this study, the caprolactone modified hydroxy acrylates (CHAs) were synthesized by ring-opening reaction of caprolactone and 2-hydroxyethyl acrylate (2-HEA) as initiator. Also, the caprolactone modified urethane acrylate (UA) oligomers were synthesized by condensation reaction of previously synthesized CHAs, 2-hydroxyethyl acrylate (2-HEA) and hexamethylene diisocyanate trimer (HDT). Using the hydroxy number of CHAs, the molecular weights of the CHAs were calculated easily and their molecular weight was similar to the theoretical molecular weight of them. The viscosity of UA oligomers decreased as increasing a content of CHA in the UA oligomer. Cure films were prepared from UA oligomer. reactive diluents, and UV initiator to investigate their physical properties. The thermal stability and color difference on high temperature for the cured film were improved as increasing the crosslinking density. Their surface hardness was also increased as increasing crosslinking density of the cured films, but their elongation at break was decreased. 
epsilon-caprolactone; caprolactone modified hydroxy acrylate; caprolactone modified urethane acrylate; UV-curing; ring-opening reaction