中文摘要：

结合活性负离子聚合与原子转移自由基聚合（ATRP），采用机理转移法制备了一系列窄分布且分子量可控的星形梳状聚丁二烯-g-聚甲基丙烯酸甲酯接枝共聚物（SC-（PB-g-PMMA））．首先通过阴离子聚合，制备星形聚丁二烯，后经甲酸一过氧化氢原位环氧化对链中部分双键进行环氧化，再与原位生成2-溴异丁酸发生酯化反应，得到具有链中活性溴的星形大分子引发剂（SPB-Brn）．然后，利用该大分子引发剂，采用CuCl／CuCl2／PMDETA催化体系，通过ATRP聚合单体MMA，合成出星形梳状SC-（PB-g-PMMA）聚合物．通过GPC，1H-NMR和FTIR等分析手段对合成的星形大分子引发剂及星形梳状聚合物进结构表征，证实得到目标产物，并同时研究了聚合物的热力学性质与溶液性质．

英文摘要：

A series of star comb polybutadiene-g-poly （methyl methacrylate） graft copolymers （SC-（PB-g- PMMA） ） with various chain lengths were synthesized with the combination of living anionic polymerization and atom transfer radical polymerization （ATRP） in sequence. First, star-shaped polybutadiene with predetermined molecular weight and microstructure was synthesized by anionic polymerization of butadiene with n-butyllithium initiator in the solvent of cyclohexane at 50℃ for 3 h. Then the in-chain living functionalized star-shaped initiator containing bromine （SPB-Brn ）s was obtained after expoxidated with performic acid in situ from hydrogen peroxide and formic acid, and esterification reaction with in situ 2-bromoisobutyrate. Finally, SC-（ PB- g-PMMA）s were prepared from the polymerization of methyl methacrylate （MMA） and SPB-Br with SPB-Br, as initiator and CuC1/CuC1JN, N, N＇, N＇, N＇-pentamethyldiethylenetriamine （PMDETA） as catalyst and ligand by atom transfer radical polymerization in the solvent of CHC13 at 60℃for 8 h. A series of star comb polybutadiene-g-poly（ methyl methacrylate） graft copolymers （SC-（PB-g-PMMA） ） with various chain lengths were synthesized by changing the monomer ratio. The properties of the SPB-Brn and the series of star-comb graft copolymers polybutadiene-g-poly（methyl methacrylate） were characterized by 1H-NMR, FTIR, GPC and DSC. The SC-（PB-g-PMMA） s in solution were also examined and their thermotropic behavior were discussed. All in all, the results show that well-defined target products with controlled molecular weight and low disperisity were obtained. The phase separation ＇and branching parameters of the copolymers varied with chain lengths.