Synthesis of Photocrosslinkable Hyperbranched Polysulfide Containing Methacryloyl Groups by the Reaction of Bis(oxetane) with Thiocyanuric Acid Followed by the Reaction with Methacrylic AnhydrideHyperbranched Polysulfide Containing Methacryloyl Groups

The synthesis and photopolymerization of hyperbranched polysulfides containing pendant methacryloyl groups (HBPS-MA) were examined. Polyadditions of l,4-bis[(3-ethy-3-xetanyl)methoxy]benzene (1,4-BEOMB) with thiocyanuric acid (TCA) were carried out to give the soluble hyperbranched polysulfides (HBPS) in satisfactory high yields. Then, we examined refractive index of the resulting HBPS. Furthermore, HBPS-MA was synthesized by the reaction of HBPS with methacrylic anhydride. The photo-initiated radical polymerization of HBPS-MA was performed in the presence of 2-methyl-l-[4-(methylthio)phenyl]-2-morpholinopropan-2-one (Irgacure 907®) as a photoinitiator in the film state upon UV irradiation to afford the insoluble cured film.