Chloride of polymer with unsaturated double-bond structural unit, and method of using same to prepare polymer brushes

The invention belongs to the technical field of functional polymer materials, and particularly relates to the chloride of a polymer with an unsaturated double-bond structural unit, and a method of using same to prepare polymer brushes. According to the method, a solution method is adopted, and chlorine is fed into a carbon tetrachloride solution of different types of polymers with diolefin structural units to prepare chloride, of different chlorin contents, of polymers with diolefin structural units. The preparation method is low in cost, convenient to carry out, effective, convenient for large-scale production, and considerable in product profit. The chlorination degree of the chloride is controllable. The chloride has the powerful molecular design capacity so that designing can be effectively carried out on the molecular structure of polymer. The chloride is used as an ATRP macroinitiator to trigger ATRP reaction of styrene monomer, butadiene monomer, methyl methacrylate monomer andthe like so as to prepare