Styrene → Styrene-butadiene-styrene

HRID 1604621Notes

Reaction equation

HRID 1604621 reaction equation
[CH2:1]1[CH2:6]CC[CH2:3][CH2:2]1.[CH2:7]=[CH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.C([Li])CCC.C=CC=C>O1CCCC1>[CH2:7]=[CH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.[CH2:6]=[CH:1][CH:2]=[CH2:3].[CH2:7]=[CH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1

Participants

6

Reactant 4

HCID 7501Styrene2×HCID 78451,3-ButadieneHCID 8078CyclohexaneHCID 178418339Butyllithium

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

In a 2 gallon autoclave reactor, 4,500 g of cyclohexane was charged, followed by 9 g of tetrahydrofuran, 112.5 g of styrene monomer and 1.7 g of n-butyllithium. This mixture was subjected to polymerization for 1 hr. Then, 525 g of 1,3-butadiene monomer was added in the reactor and polymerization was carried out for 1 hr. Thereafter, 112.5 g of styrene monomer was charged and subjected to further polymerization for 1 hr, to give a styrene-butadiene-styrene block copolymer with a number average molecular weight of about 40,000 in which the styrene bond amounted to 30.4% (block styrene content 29.9%) while the 1,2-vinyl bond content of the butadiene unit amounted to 40.5%. 2.5 mmol of living lithium was found to be contained in per 100 g of the polymer.

Workup

  1. customThis mixture was subjected to polymerization for 1 hr
  2. customsubjected to further polymerization for 1 hr

Sources & evidence

ORD record
ord-d5cf9ee140b64a4084f036e37bc4cd60
Source dataset
uspto-grants-1999_11
Patent number
US05994477

Reaction notes

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