Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

Participants

Reaction Steps

After the first addition of a precalculated amount of anhydrous styrene to build up the S1 block, and 15 minutes of reaction time, further initiator solution (sec-butyllithium) was added to initiate further chains. Further blocks are built up by adding portions of anhydrous styrene and butadiene, and by simultaneous addition of anhydrous styrene and butadiene to build up a copolymer block. The reaction time to build up a styrene block was 15 minutes, and that for a butadiene block, and also that for a styrene-butadiene copolymer block, was 40 minutes. The copolymer blocks were coupled by adding Endenol D 82 (Henkel KGaA, 40% solution in toluene) at 50° C. within a period of 15 minutes, to give the star-block copolymer. 0.1% (based on the solids content of the star-block copolymer) of Kerobit TBK (2,6-di-tert-butyl-p-kresol) was added to stabilize the material.

Provenance & Evidence