聚甲基丙烯酸甲酯-聚甲基丙烯酸两亲性嵌段共聚物的制备及自组装形态的研究

以2-溴异丁酸乙酯为引发剂, 氯化亚铜/联二吡啶为催化剂, 通过原子转移自由基聚合(ATRP)获得分子链末端含一个α-溴原子的聚甲基丙烯酸甲酯(PMMA-Br), 以此为大分子引发剂引发甲基丙烯酸铅Pb(MA)2]单体进行ATRP反应, 制得PMMA-b-Pb(MA)2]嵌段共聚物, 将此共聚物在盐酸中进行离子交换即得聚甲基丙烯酸甲酯-聚甲基丙烯酸的两亲性嵌段共聚物P(MMA-b-MAA)]. 用FTIR, GPC, NMR和SEM方法对共聚物进行了表征.

Synthesis of P(MMA-b-MAA) Amphiphilic Block Copolymer and Its Self-organization Behavior in Solvent

Using ethyl 2-bromoisobutyrate as the initiator, CuCl/α-α′-bipyridine(BPy) as the catalyst and ligand, the poly(methyl methacrylate) with single-caped halogen(PMMA-Br) was synthesized by atom transfer radical polymerization(ATRP). Then using PMMA-Br as the macroinitiator and CuCl/BPy as the catalyst and ligand, the block copolymer PMMA-b-Pb(MA)2] was synthesized. After putting the copolymer PMMA-b-Pb(MA)2] dip in hydrochloric acid for one day, the amphiphilic copolymer P(MMA-b-MAA) with a low polydispersity was synthesized by ion exchange. Then P(MMA-b-MAA) was dissolved in DMF followed by dialyzsis in deionized water, the nanoaggregate  of P(MMA-b-MAA) comes into being. All products were characterized by FTIR, GPC, NMR and SEM. The results show that the amphiphilic copolymer containing carboxylic block can be prepared though ATRP and ion exchange by introduction of  a new monomer containing metal ions,  lead dimethacrylate Pb(MA)2.