Styrene → Styrene

Participants

Reaction Steps

In a 2 gallon autoclave reactor, 4,500 g of cyclohexane was charged, followed by 9 g of tetrahydrofuran and 1.3 g of n-butyllithium, after which 225 g of styrene monomer and 525 g of 1,3-butadiene monomer were added simultaneously 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 approximately 60,000 in which styrene content amounted to 29% while the 1,2-vinyl bond content of butadiene unit amounted to 30.5%. 1.67 mmol of living lithium was found to be contained in per 100 g of the polymer.

Provenance & Evidence