UV-curable high refractive index di-functional epoxy acrylate, 4,4'-thiodibenzenethiol diglycidyl ether diacrylate, was synthesized from acrylic acid and 4,4'-thiodibenzenethiol diglycidyl ether that was obtained by reacting 4,4'-thiodibenzenethiol and epichlorohydrin using a direct method (Taffy process). Its chemical structure was identified by 1H NMR and FTIR. After its dilution with a reactive diluent, 2-phenoxythiol ethyl acrylate as 5, 10, 15, 20, and 30 wt% content, the relationship between their viscosity and refractive index was investigated. Their degree of cure decreased with increasing the amount of reactive diluent, and the refractive index of UV-cured film increased with increasing the degree of cure.

4,4'-Thiodibenzenethiol을 기반으로 이관능 에폭시 수지인 4,4'-thiodibenzenethiol diglycidyl ether를 직접합성법으로 합성하였다. 합성된 에폭시 수지가 광경화가 가능하도록 acrylic acid와 반응시켜 광경화형 고굴절 이관능 에폭시 아크릴레이트인 4,4'-thiodibenzenethiol diglycidyl ether diacrylate를 합성하였으며 1H NMR과 FTIR을 이용하여 화학구조를 확인하였다. 이관능 에폭시 아크릴레이트와 함께 반응성 희석제인 2-phenoxythiol ethyl acrylate를 5, 10, 15, 20, 30 wt% 희석하여 점도와 굴절률과의 상관관계를 확인하였으며 광경화 후 경화필름의 굴절률 변화를 고찰 하였다. 반응성 희석제의 농도가 증가함에 따라 경화물의 경화도가 낮아졌으며, 경화도가 클수록 경화 후 굴절률은 높아지는 경향을 확인하였다.

Keywords: epoxy acrylate; 4,4'-thiodibenzenethiol diglycidyl ether; Taffy process; UV-curing; refractive index; degree of cure.