In this work, benzyl alcohol (BzOH) was first used to react with potassium hydride (KH) to form benzyloxy anion (BzO^－) as an initiator of oxyanion-initiated polymerization. And then it can polymerize 2-(N,N-dimethylamino)ethyl methacrylate] (DMAEMA or DMA), 2-(N,N-diethylamino)ethyl methacrylate] (DEAEMA or DEA) and 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate) (OFPMA) in sequence to yield fluorinated amphiphilic triblock copolymers PDMA-b-PDEA-b-POFPMA and PDEA-b-PDMA-b-POFPMA. The chemical structures, molecular weights and molecular weight distributions of PDMA-b- PDEA-b-POFPMA and PDEA-b-PDMA-b-POFPMA triblock copolymers with the same components but different block sequence were characterized by ¹H NMR, ¹⁹F NMR and GPC. The self-assembly behavior of the copolymers in aqueous solution with different pH values was demonstrated by the combination of surface tension, fluorescence probe method, zeta potential, light scattering and transmission electron microscopy.

Key words: pH-responsive, oxyanion-initiated polymerization, DMAEMA, DEAEMA, fluoropolymer