| 초록 |
Poly(vinyl alcohol) (PVA) is industrially produced by radical polymerization of vinyl acetate, followed by hydrolysis of the obtained polymer. It is known that the higher syndiotactic PVA improves its properties such as toughness, heat resistance, and elastic modulus. Because the nature of active radical species has low energy barrier between two enantiomers, it is very difficult to control stereochemistry in radical polymerization. Protic solvents like fluoroalcohols or lewis acid are known to be efficient for the stereo-controlled radical polymerization of vinyl esters. Radical addition and fragmentation chain transfer (RAFT) process is one of the controlled radical polymerization techniques that prepare polymers with controlled architecture. We pursued a possibility of controlling both stereospecificity and architecture by using fluoroalcohol solvent in RAFT of vinyl acetate. |
