Photopolymerization method for preparing block copolymer with main-chain semi-fluorinated alternating copolymer

A photopolymerization method for preparing a block copolymer with a main-chain “semi-fluorinated” alternating copolymer, comprising steps of:

• under a protective atmosphere, subjecting a methacrylate monomer and a “semi-fluorinated” alternating copolymer (AB)n macroinitiator to light-controlled living radical polymerization in an organic solvent at 20-30° C. in the presence of a photocatalyst, where the polymerization is continued for at least half an hour under irradiation of light at 390-590 nm, to obtain a block copolymer of the main-chain “semi-fluorinated” alternating copolymer, wherein
• when the “semi-fluorinated” alternating copolymer(AB)n macroinitiator has a structure of Formula (1), the resulting block copolymer of the main-chain “semi-fluorinated” alternating copolymer has a structure of Formula (2);
• and
• when the “semi-fluorinated” alternating copolymer(AB)n macroinitiator has a structure of Formula (3), the resulting block copolymer of the main-chain “semi-fluorinated” alternating copolymer has a structure of Formula (4),
• in which Formulas (1)-(4) are shown below:
• where x=4-8, y=0-3, n=4-30, and m=100-500;
• R is selected from a C1-C6 alkyl group, an aryl ether group or an acyloxy group;
• and
• R1 is selected from a C1-C6 alkyl group, a polyethylene glycol group, a C1-C6 alkyl group substituted with amino, or a C1-C6 alkyl group substituted with epoxy.