Isoprene → HCID 19842620, compound

Participants

Reaction Conditions

Reaction Steps

To a 2.6 liter reactor were charged 1499 g of cyclohexane and 85.8 g of styrene monomer. The mixture was heated to 60° C. and 7.8 ml of a 0.70 molar solution of sec-butyllithium initiator in cyclohexane was added. After 41 minutes, the reaction temperature was reduced to 58° C. and 118.5 grams of isoprene was added. After 39 minutes the living styrene-isoprene diblock polymer was coupled to form a linear styrene-isoprene-styrene triblock polymer by adding 32 ml of 0.12M 1,2-dibromoethane in cyclohexane over a period of 11 minutes. A hindered phenol antioxidant was added to the polymer solution which was then devolatized in a vacuum oven under nitrogen at 100° C. for 3 hours.

Provenance & Evidence