A novel pH-sensitive fluorinated triphilic block cocopolymer P(EHMA-co-MAA)-b-PFOEA-b-P(EHMA-co-MAA)was synthesized by using the reversible addition fragmentation chain transfer(RAFT)method,incorporating methacrylic acid,2-ethylhexyl methacrylate,and 2-perfluorooctyl ethyl acrylate blocks used as hydrophilic,lipophilic,and fluorophilic units respectively.The chemical structure of block copolymer was characterized by infrared spectroscopy(IR),nuclear magnetic resonance(NMR),gel permeation chromatography(GPC),and fluorine element analysis(F-EA).The self-assembly of fluorinated block copolymer in dimethylformamide/water dispersions was investigated.Spherical micelles with silkworm chrysalis-shaped surface formed by copolymer were verified by scanning electron microscopy,and the diameter of micelles increased significantly along with the increase of the content of fluorinated block.The morphology transition from spheres to bowl-shaped vesicles was obtained by adding aqueous solution of HCl into the system,and as the concentration of HCl increases,vesicles will merge together.