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

Participants

Reaction Steps

An AB block polymer of styrene-isoprene was prepared by adding 0.42 ml. of 1.18 N sec-butyl lithium to a mixture of 10 g. of styrene of 175 ml. of benzene and 5 ml. of tetrahydrofuran at room temperature. The mixture was allowed to polymerize for 2 hours and 40 g. of dry air-free isoprene was added and the polymerization continued for 2 additional hours. The product was isolated by precipitation into methanol, yielding 27.5 g. of block polymer dispersant.

Provenance & Evidence