中文摘要：

以酰基化试剂α-溴代丙酰溴对异丁烯和对甲基苯乙烯的二元共聚物中的p-甲基苯乙烯单元进行Friedel—Crafts酰基化取代反应，获得大分子引发剂。以此引发剂引发丙烯酸叔丁酯的原子转移自由基聚合制得梳状异丁烯-p-甲基苯乙烯接枝丙烯酸叔丁酯共聚物。所得产物用FTIR、^1H—NMR、^13C—NMR和GPC等进行了表征，结果表明，二元共聚物的数均分子量约为25000，分子量分布约为2．18，其中p-甲基苯乙烯的摩尔分数约为5％-8％；共聚物的酰基化取代度可达83％；所得丙烯酸叔丁酯接枝共聚物的数均分子量可到58800，分子量分布约为2．26。

英文摘要：

Poly（isobutylene-p-methylstyrene-g-tert-butyl acrylate） [P（IB-co-pMS-g-tBA）] has been synthesized by sequential cationic polymerization and ATRP in CH2Cl2 solution . The procedure consists of three steps： firstly, the random copolymer of poly （isobutyl-p-methylstyrene） [ P （IB-co-pMS） ] was synthesized through cationic polymerization; then, the p-methylstyrene unit in the above copolymer was subjected to an electrophilic substitution reaction with a-bromopropionyl bromide as an acylating agent and aluminum chloride as a catalyst; and finally, the resulting acylated copolymer P（IB-co-pMS-CO-CHBr-CH3） （ Mw = 28000, Mw/Mn = 2.12） was employed as a macroinitiator, together with CuBr and N, N, N＇, N＇, N＂-pentamethyldiethylenetriamine （PMDETA）, to initiate the ATRP of tert-butyl acrylate. The degree of substitution of a-bromopropionyl groups in P（IB-co-pMS） was determined by ^1H-NMR spectroscopy to be 83 %, according to the ratio of the integral of the phenyl proton signal to that of the signal from the proton in the -CHBr-group. The copolymers characterized by FTIR, ^1H-NMR, ^13C-NMR and GPC measurements. The molecular weight （Mn） and dispersity （Mw/Mn） of the graft copolymer [P（IB-co-pMS-g-tBA） ] were 58800 and 2.26 respectively.