Isoprene → HCID 19842620, compound

Participants

Reaction Conditions

Reaction Steps

A stainless autoclave dried well and flushed with nitrogen was charged with 266 g of styrene and 2,500 g of cyclohexane. After the solution had been heated to 40° C., 3.5 mL of a 1.0 M hexane solution of n-butyllithium was added thereto, it was heated to 50° C. and reacted for 2 hours. 60 g of isoprene was then added as a cyclohexane solution and reacted for a further 2 hours. 266 g of styrene and 700 g of cyclohexane were then added and reacted for a further 2 hours. After the reaction was completed, 0.7 g of isopropanol was added to give a styrene-isoprene-styrene block copolymer. The average molecular weight obtained by GPC was 107,000, and the molecular weight distribution was 1.45.

Provenance & Evidence