Styrene → Styrene

Participants

Reaction Steps

In a 2 gallon autoclave reactor, 4,500 g of cyclohexane was charged. 9 g of tetrahydrofuran and 1.1 g of n-butyllithium were injected to the reactor, after which 225 g of styrene monomer and 525 g of 1,3-butadiene monomer both were simultaneously injected to the reactor and the resulting mixture was subjected to polymerization for 1 hr, to give a styrene-butadiene-styrene block copolymer with a number average molecular weight of about 60,000 in which styrene content amounted to 29% while the 1,2-vinyl bond content of butadiene unit amounted to 30.5%. The copolymer contained 1.67 mmol of living lithium per 100 g of the polymer.

Provenance & Evidence