| 초록 |
Sulfur-containing polymers have been attracting much attention because of optical and thermal properties. Polythiocarbonate of high refractive index and low dispersion is widely used in optical lenses, optical fibers, etc. Ring opening polymerization(ROP) of monomers including sulfur is promising way to synthesize main chain polymer among conventional methods, such as phosgene involved coupling, metal catalyzed copolymerization, and sulfur-alkylation. We observed efficient ROP of cyclic dithiocarbonates with participation of neighboring sulfur group. Vinyl group was introduced to the monomer to examine the similar effect during the ROP. Cyclic dithiocarbonates were synthesized by coupling reaction of epoxides with CS2 or potassium ethyl xanthate. Cyclic ditio and trithio carbonates were prepared from isoprene monoxide. The polymerization of the monomers with a vinyl group was initiated by methyl triflate and monitored with 1H-NMR to detect intermediate and propagation. |
