| 초록 |
UV (ultraviolet) curing behavior of an epoxy-acrylate resin system comprising epoxy-acrylate oligomers, photoinitiators and reactive diluents was investigated by FTIR spectroscopy. The photoinitiator used was Darocur 1173 (2-hydroxy-2-methyl-1-phenylpropan-1-one). HDDA (hexanediol diacrylate) having two functional groups was used as reactive diluents. UV curing of the epoxy-acrylate resin system was carried out in a UV chamber or in a conveyer system. The effects of total UV dosage, one-step or stepwise UV dosage, UV intensity and air (oxygen) atmosphere on the curing behavior of the epoxy-acrylate resin system were investigated. Fractional conversion of the epoxy-acrylate resin system during polymerization was calculated from the area of the absorption peak for the vinyl group vibration occurring at 810 cm-1. The conversion of the epoxy-acrylate resin system increased rapidly at the initial stage of UV curing process but increased very slowly after that. The conversion of the resin system was mainly affected by total UV dosage. |
