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以α,α’-二甲基-α-乙酸-三硫代碳酸酯(BDATC)为链转移剂,采用可逆-加成-断裂链转移(RAFT)自由基聚合方法合成了末端带有—COOH官能团的两亲性嵌段共聚物聚苯乙烯-b-聚甲基丙烯酸聚乙二醇单甲醚-b-聚苯乙烯(PSt-b-POEOMA-b-PSt),这种含有亲水性端基的嵌段共聚物可以自组装成核-壳结构的纳米微粒,用于载药高分子的模板研究。利用FTIR、1HNMR、GPC对产物结构进行表征,用热失重(TG)和差示扫描量热(DSC)的方法研究了3种不同比例的嵌段共聚物的热性能。实验结果表明,通过RAFT聚合方法得到了所设计的嵌段共聚物,相对分子质量(简称分子量,下同)分布1.35左右;嵌段共聚物的热稳定性较好,通过玻璃化转变温度(Tg)的变化推测出嵌段共聚物中两种嵌段比例对两嵌段相容性的影响。
A series of polycarboxylic acid derivatives with terminal -COOH were synthesized by reversible addition-fragmentation chain transfer (RAFT) free radical polymerization using α, α’-dimethyl-α-acetic acid-trithiocarbonate (BDATC) Functional amphiphilic block copolymer polystyrene-b-poly (ethylene glycol monomethyl ether) -b-polystyrene (PSt-b-POEOMA-b-PSt), which contains a hydrophilic End-block copolymers can be self-assembled into core-shell nanoparticles for drug-loaded polymer template studies. The structure of the product was characterized by FTIR, 1HNMR and GPC. The thermal properties of the three block copolymers with different proportions were studied by TG and DSC. The experimental results show that the designed block copolymer is obtained by RAFT polymerization, the molecular weight (molecular weight, the same below) distribution of about 1.35; block copolymer thermal stability is better, through the glass transition temperature (Tg ) Changes in the block copolymer in the proportion of two blocks on the compatibility of two blocks.