Styrene → HCID 86741594, compound

Participants

Reaction Steps

In an autoclave were placed 4,000 g of cyclohexane, 100 g of 1,3-butadiene monomer, 0.53 g of n-butyllithium and tetrahydrofuran in a proportion of 40 moles per mole of n-butyllithium. They were subjected to polymerization for 30 minutes at 70° C., and then 150 g of styrene was added and subsequently polymerized for 60 minutes, after with 600 g of 1,3-butadiene was added and polymerized for 150 minutes. Thereafter, 150 g of styrene was added and subsequently polymerized for 60 minutes, to obtain a butadiene-styrene-butadiene-styrene block copolymer. The resulting living polymer solution was poured into a large amount of methanol for deactivation and precipitation. The precipitated polymer was vacuum-dried for 50 hours at 60° C. The polymer was a block copolymer having a bound styrene content of 30%, a block styrene content of 28% and a 1,2-vinyl content in the butadiene units of 35% (25% based on the weight of the entire copolymer) and having a number average molecular weight of about 120,000.

Provenance & Evidence