Method for producing polymer

A method for producing a polymer, comprising:

• reacting a first mixture containing an aromatic compound having a double bond and a metal-containing compound to produce an aromatic organometal compound;
• anionically polymerizing a monomer in the presence of the aromatic organometal compound to produce a polymer having a metal at a terminal thereof;
• and
• reacting a second mixture of the polymer having a metal at the terminal thereof and a compound containing at least two halogen atom to form a polymer having a halogen atom at a terminal thereof,
• wherein the metal-containing compound comprises an organometal compound and a metal halide, and a ratio (M2/M1) of a molar number (M2) of the metal halide to a molar number (M1) of the organometal compound in the mixture is in a range of 1 to 30,
• wherein the compound containing a halogen atom is included in the second mixture in a molar ratio of 1 mol % to 10 mol % relative to the monomer forming the polymer having a metal at a terminal thereof,
• wherein the monomer is represented by Formula 2,
• wherein, R is hydrogen or an alkyl group,
• X is an oxygen atom, a sulfur atom, —S(═O)2—, a carbonyl group, —C(═O)—X1— or —X1—C(═O)—, wherein X1 is an oxygen atom, a sulfur atom, —S(═O)2—, an alkylene group, an alkenylene group or an alkynylene group, and
• Y is an alkylaryl group or an alkyloxyaryl group,
• wherein the compound containing at least two halogen atoms is represented Formula 4,
• wherein, R1 to R6 are each independently hydrogen, an alkenyl group, an alkynyl group, a haloalkyl group, a haloalkenyl group, a haloalkynyl group, an alkylene group, an alkenylene group or an alkynylene group, where the number of halogen atoms contained in R1 to R6 is two or more,
• wherein the reaction of the first mixture to produce the aromatic organometal compound is performed at a temperature in a range of −60° C. to −36° C., and
• wherein the reacting of the second mixture to form the polymer having a halogen atom at a terminal thereof is performed at a temperature in a range of −60° C. to −36° C.