Fluorine-based polymer, fluorine-based polymer composition comprising same, and fluorine-based polymer membrane using same

A fluorine-based polymer composition comprising a fluorine-based polymer represented by formula 1 below and an organic solvent:

• (In formula 1 above,
• Rf is C1-20 fluorinated straight alkyl or C3-20 fluorinated branched alkyl, in which the number of fluorocarbon is 3 to 5;
• R1-4 is independently hydrogen (H), methyl (CH3) or halogen;
• R5 is C1-20 straight alkyl or C3-20 branched alkyl;
• based on the molar ratio of x+y+p+q=100, x is 30 to 70, p is 5 to 20, and y+q is 20 to 60;
• and
• z is 1-5.).

A fluorine-based polymer membrane comprising a fluorine-based polymer represented by formula 1 below:

• (In formula 1 above,
• Rf is C1-20 fluorinated straight alkyl or C3-20 fluorinated branched alkyl, in which the number of fluorocarbon is 3 to 5;
• R1-4 is independently hydrogen (H), methyl (CH3) or halogen;
• R5 is C1-20 straight alkyl or C3-20 branched alkyl;
• based on the molar ratio of x+y+p+q=100, x is 30 to 70, p is 5 to 20, and y+q is 20 to 60;
• and
• z is 1-5.).