Styrene → Isoprene

Participants

Reaction Steps

The polymerization was continued for 30 minutes at 70°C. Upon addition of styrene, it appeared that the reaction product of the secondary butyl lithium and divinyl benzen separated out in gel-form and did not go into solution. With the aid of the initiator gelated in this way an A-B-(A)n block copolymer was obtained by successive polymerization isoprene (50 ml) and styrene (10 ml). The properties of the resulting block copolymer are given below:

Provenance & Evidence