Styrene → Styrene-butadiene-styrene

Participants

Reaction Steps

186 g of butadiene and 2.4 ml of a 0.5 M solution of tetramethylethylenediamine in cyclohexane is introduced into 4 litres of deaerated cyclohexane. After compensation for the impurities supplied by the solvent and the monomer using n-butyllithium, 3.7 ml of a 0.5 mol/l solution of n-butyllithium in cyclohexane is introduced. The polymerization of the polybutadiene block is effected at 60° C. After conversion of all the butadiene, 114 g of styrene is introduced, which is polymerized at 60° C. for 60 minutes. The copolymer is then protonated by addition of a large excess of methanol in solution in toluene, antioxidized by the addition of 2,2′- methylene bis(4-methyl-6-tert. butylphenol) (1 g per 100 g of monomer), then recovered by steam stripping and dried in an oven at reduced pressure at 60° C.

Provenance & Evidence