Isoprene → 2-Methylbuta-1,3-diene;styrene

Participants

Reaction Conditions

Reaction Steps

In a solution of styrene (41 g) in cyclohexane (1100 g), 0.3 ml of tetrahydrofuran and 1.2 g of 15 wt % n-butyllithium solution were added to initiate polymerization. The reaction was continued for 30 minutes, and the temperature was increased from 40° C. to 50° C. After most of the styrene monomer was reacted, 123 g of isoprene solution was added into the polymer mixture. The reaction was continued for an additional 90 minutes, and the temperature was increased from 55° C. to 80-90° C. After all of the isoprene monomer was completely reacted, a living styrene-isoprene block copolymer was formed in the first step.

Provenance & Evidence