Degenerative Transfer (DT) Polymerization Of Vinyl Acetate

End-functional poly(vinyl iodoacetate) (PVAc-I) were prepared by degenerative transfer(DT) polymerization 2.2'-azobis(isobutyronitrile) (AIBN) as radical initiator in the presence of molecular iodine (I2). The process of degenerative transfer(DT) polymerization in the presence of molecular iodine (I2) is based on the direct reaction of radicals from 2.2′-azobis(isobutyronitrile) (AIBN) with molecular iodine (I2), which gives the corresponding alkyl iodideα-iodoisobutyronitrile (CH3)2(CN)C-I acted as transfer agent in the polymerization of vinyl acetate(VAc). The influence of reaction temperature and raw materials different molar ratio of [VAc]:[AIBN]:[I2] was investigated, which indicated that the polymerization of vinyl acetate(VAc) by this method with predictable molecular weights and narrow molecular polydispersities is well at 75℃. A series of PVAc-I with predictable molecular weights and narrow polydispersities(Mw/Mn≤1.41) were successfully prepared by degenerative transfer polymerization in the presence of molecular iodine at 75℃and the structure of PVAc-I was investigated using 1H NMR. The iodine at the end of the poly(vinyl iodoacetate) (PVAc-I) by degenerative transfer polymerization in the presence of molecular iodine is active proved by poly(vinyl acetate) block poly(methyl methacrylate) with narrow molecular polydispersities(Mw/Mn=1.43).