| 초록 |
Since the active radicals has low energy barrier between two enantiomers, it is very difficult to control stereochemistry in radical polymerization. Protic solvents such as fluoroalcohols are known to be efficient for controlling stereochemistry in radical polymerization of vinylesters. Another approach to improve stereoregularity of the prepared polymer is lowering polymerization temperature. Although radical addition and fragmentation chain transfer (RAFT) process is effective to prepare polymers with specific molecular weight, it usually uses thermal initiators as a radical source, which make it difficult to lower the polymerization temperature. In this work, we used photoinitiation process to generate radicals. RAFT process of vinyl acetate in fluoroalcohol using photoinitiation process was conducted and the effect of fluoroalcohol and reaction temperature on the stereospecificity of the prepared polymer was studied. |
