Active center transformation polymerization from a radical to a cationic mechanism of para-methoxystyrene(MOS) was performed by using 2
2′-azoisobutyronitrile (AIBN) as a radical initiator and diphenyliodonium hexafluorophosphate(Ph2I+PK-6) as an electron acceptor.Block copolymers of poly(MOS-b-CHO/DECO) were prepared by one step by adding monomer cyclohexene oxide(CHO) and bifunctional monomer 1
2
5
6-diepoxycyclooctane (DECO) to the above system.Using bifunctional monomer DECO successfully eliminated homopolymers formed by chain transfer reaction during cationic polymerization.The polymers obtained by the system containing MOS
CHO
AIBN
Ph2I+ PF-6 and DECO were characterized by 1H-NMR
extraction separation
and gel permeation chromatography (GPC)
etc.Neither homopolymer of PCHO nor copolymers of CHO and DECO (poly(CHO-co-DECO))were obtained by this system
suggesting the success and the efficiency of the method.