采用基团转移聚合、阴离子聚合以及高分子偶合反应的方法，合成了一种结构明确、链长均匀、分子量可控的聚苯乙烯接枝聚甲基丙烯酸甲酯。主链聚苯乙烯由阴离子聚合得到，并进行溴甲基化。支链活性聚甲基丙烯酸甲酯由基团转移聚合制备。经偶合反应后得到分子量为3x104~7x104、多分散性指数d为1.2~1.4的接枝共聚物。用1HnMr，gPC和dSC表征接枝产物。和均聚物相比，共聚物的玻璃化温度较低。A novel well deFined graFt copolymer(PS g PMMA) with control over the length of both backbone and side chain was synthesized by coupling reaction of living polymethyl methacrylate with bromomethylated polystyrene.The backbone polymer was prepared by anionic polymerization of styrene with n butyllithium Followed by bromomethylation using C 8H 17 OCH 2Br/SnCl 4.The living PMMA was prepared by group transFer polymerization of MMA.The graFt copolymers with narrow molecular weight distribution, D=1.2￣1.4, at the Mn of around 3×10 4￣7×10 4 were obtained.Structure of the product was characterized by 1H NMR, 13 C NMR, GPC and DSC.Comparing with the homopolymer PS and PMMA, the copolymer has lower glass temperature
