Graft copolymers of βpinene with methyl methacrylate(MMA)

butyl acrylate (BA) or styrene(St) were synthesized by the combination of living cationic polymerization and atom transfer radical polymerization (ATRP)．β-Pinene polymers with predetermined molecular weights and narrow molecular weight distributions (MWDs)were prepared by living cationic polymerization with the 1-phenylethyl chloride／TiCl4／Ti(OiPr)4／nBu4NCl initiating system

and the obtained polymers were brominated quantitatively by N—bromosuccinamide in the presence of AIBN

yielding poly(β—pinene)macroinitiators with 50％ of bromine contents(Br/β-pinene unit molar ratio=0．5)．The macroinitiator

in conjunction with CuBr and 2

2'-bipyridine

was used to initiate ATRP grafting of BA．MMA and St．All of the grafting polymerizations induced linear first-order kinetic plots and gave graft copolymers with controlled molecular weights and MWDs

suggesting that these polymerizations are controllable．The structures of the obtained graft copolymers of β-pinene with(methyl)methacrylate or styrene were confirmed by 1H-NMR spectra．