Controlled radical copolymerization including atom transfer radical polymerization(ATRP) and radical reversible addition-fragmentation chain transfer polymerization(RAFT) of iso-butyl vinyl ether (iBVE) with electron-withdrawing monomers such as maleic anhydride and N-substituted maleimides

have been studied．Results show that ATRP of iBVE with electron-withdrawing monomers does not work well

while the well-defined copolymers are obtained via RAFT polymerization．The copolymers thus obtained possess alternating structure

predetermined molecular weight and molecular weight distribution as narrow as 1.2～1.4．