| 초록 |
In this study, polystyrene was synthesized using n-butyllithium as anionic initiator in the mixture of tetrhydrofuran (THF) and benzene (5/95, v/v) at room temperature and chain end hydroxylation using ethylene oxide of polystyryllithium was performed by addition of purified ethylene oxide (EO) mixed with benzene at 35oC. Hydroxyl polystyrene was precipitated in methanol to get powder and dried in a vacuum oven for 6h. A quantitative carboxylation was achieved by the reaction of ω-hydroxyl PS with succinic anhydride at 35oC for 24h. -Tosylate PS was also obtained by the reaction of hydroxyl PS with p-toluenesulfonyl sulfonyl chloride. The tosyl end group was then converted to various end functional groups like azide, amine, and thiol. The ω-thioacetate PS was reduced using NaBH4 in THF resulting in the production of ω-thiol PS. In this presentation we will report the preliminary results for the chain end functionalizations. |
