Methanol → Styrene-butadiene-styrene

Beteiligte Stoffe

Reaktionsschritte

In a 100-ml of toluene was dissolved 5 g of the polymer produced above. The resulting solution was subjected to high speed centrifugation at 10,000 rpm to separate it into a toluene-soluble portion (A) and a toluene-insoluble portion (I). The toluene-insoluble portion was 20.2% of the original polymer. Methanol was added in small portions to the toluene-soluble portion to precipitate part of the polymer of the toluene-soluble portion and thus Sample B was obtained. Then, a large amount of methanol was added to the residue to obtain Sample C. Thus, the toluene-soluble portion of the original polymer was subjected to fractional precipitation to obtain Samples B and C. Incidentally, the styrene-butadiene-styrene block copolymer produced in the first step of polymerization was named "Sample S".

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