Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

Participants

Reaction Steps

In a polymerization vessel under nitrogen atmosphere were charged a cyclohexane solution containing 10 parts by weight of butadiene and 0.09 part by weight of n-butyllithium was added thereto. After polymerizing the mixture at 70° C. for 1 hour, a cylcohexane solution containing 90 parts by weight of styrene was added to the reaction mixture and polymerization reaction was continued at 70° C. for 2 hours. Thereafter, the polymerization reaction was stopped by adding methanol. The resulting polymer was separated from the polymer solution thus obtained by solidifying with methanol and then dried to obtain a styrene/butadiene block copolymer (weight average molecular weight: 100,000).

Provenance & Evidence