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β-环糊精(β-CD)经2-溴异丁酰溴酰化后合成具有多个支链的引发剂2-溴异丁酰化β-环糊精(β-CD-BIBB)。然后以丙烯酰胺(AM)和甲基丙烯酸二甲氨基乙酯(DMAEMA)为共聚单体,β-CD-BIBB为引发剂,2,2’-联吡啶(BPY)为配位剂和CuBr为催化剂,采用原子转移自由基聚合(ATRP)技术合成阳离子星型聚合物。反应温度为80℃,BPY与CuBr摩尔比一定时,聚合物的黏均相对分子质量(简称黏均分子量,下同)随着DMAEMA与β-CD-BIBB摩尔比增加而升高;在DMAEMA与β-CD-BIBB摩尔比一定时,黏均分子量随着BPY与CuBr摩尔比的增加而升高。通过FTIR、1HNMR、DSC、TG等对β-CD-BIBB和阳离子星型聚合物的结构进行了表征。
Synthesis of 2-bromoisobutyrylated β-cyclodextrin (β-CD-BIBB) with several branches by β-cyclodextrin (β-CD) acylation with 2-bromoisobutyryl bromide. Then using acrylamide (AM) and dimethylaminoethyl methacrylate (DMAEMA) as comonomers, β-CD-BIBB as initiator, 2,2’- bipyridine (BPY) as complexing agent and CuBr as Catalyst, a cationic star polymer was synthesized by atom transfer radical polymerization (ATRP). When the reaction temperature is 80 ℃ and the molar ratio of BPY to CuBr is constant, the viscosity-average molecular weight (Mw) of the polymer increases with the increase of the molar ratio of DMAEMA and β-CD-BIBB. When the molar ratio of β-CD-BIBB is constant, the viscosity-average molecular weight increases with the increase of the molar ratio of BPY and CuBr. The structures of β-CD-BIBB and cationic star polymers were characterized by FTIR, 1HNMR, DSC, TG and so on.