Styrene → Styrene-butadiene-styrene

Participants

Reaction Conditions

Reaction Steps

In an autoclave, 400 g of cyclohexane, 15 g of styrene monomer, and 0.11 g of n-butyl lithium were placed and then heated at 60° C. for three hours to polymerize the monomers. Subsequently, the resultant reaction solution and 70 g of 1,3-butadiene monomer newly added thereto were heated at 60° C. for three hours to induce polymerization of the monomers. Finally, the resultant reaction solution and 15 g of styrene monomer added thereto were heated at 60° C. for three hours. Consequently, there was obtained a styrene-butadiene-styrene type living block copolymer having a bound styrene content of 30%, a block styrene content of 29.5%, a 1,2-vinyl bond content of 13% in the butadiene units (9% based on the total of polymer), and a number-average molecular weight of about 60,000. This polymer contained 1.65 millimoles of living lithium per 100 g of the polymer.

Provenance & Evidence