| 초록 |
Controlled radical polymerization techniques have been widely used to synthesize polymers with pre-determined molecular weight and low polydispersity. However controlling stereoregularity is not easy because of the intrinsic nature of the active radical species which are of low energy barrier between two enantiomers. To improve stereoregularity of the prepared polymer, lowering polymerization temperature is generally preferred. RAFT process, though, uses conventional thermal initiators as radical sources should be performed at an elevated temperature. In this work, we used photoinitiation process to generate radicals in RAFT of vinyl acetate. With careful selection of photoinitiator, UV irradiation condition, and RAFT agent, it was possible to prepare polymers with controlled architectures. Kinetic studies revealed that the polymerization was of living characters, and remarkably much faster than the one using thermal initiation process. |
