Aromatic Organosulfur Functionalized 1,4-cis Polybutadiene

A preparation method of aromatic organosulfur functionalized 1,4-cis polybutadiene comprising:

• a first step of polymerizing 1,3-butadiene or butadiene derivative in the presence of an alkali metal catalyst or a catalyst comprising 1) 1 mol of a rare earth element compound or a transition metal compound, 2) 1 to 10 molar equivalents of a halogen containing compound, and 3) 10 to 100 molar equivalents of an organoaluminum compound in a nonpolar solvent to prepare 1,4-cis polybutadiene;
• and
• a second step of polymerizing 100 parts by weight of the resultant 1,4-cis polybutadiene with 0.05 to 5 parts by weight of an aromatic organosulfur compound to prepare aromatic organosulfur functionalized 1,4-cis polybutadiene represented by the following Chemical Formula 1 or Chemical Formula 2:
• where l, m, n and o represent the number of repeating units of polybutadiene main chain, with l ranging from 30 to 99 weight %, m ranging from 0.05 to 5 weight %, n ranging from 0 to 50 weight %, o ranging from 0 to 50 weight %, and l+m+n+o=100 weight %, SAr represents an aromatic organosulfur compound, and R1 represents an isocyanate compound.