Styrene → Styrene-butadiene-styrene

HRID 2188043Notes

Reaction equation

HRID 2188043 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:9]([Li])[CH2:10][CH2:11][CH3:12].C=CC=C.C(Cl)(C)(C)C>O1CCCC1.C1CCCCC1>[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:9]=[CH:10][CH:11]=[CH2:12].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

7

Reactant 4

HCID 7501Styrene2×HCID 78451,3-ButadieneHCID 10486tert-BUTYL CHLORIDEHCID 178418339Butyllithium

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8078CyclohexaneSolvent

Procedure

4800 g of cyclohexane was placed in a 10 l autoclave reactor, followed by the addition of 11 g of tetrahydrofuran, 124 g of styrene monomer and 16 mmol of n-butyl lithium for 30-minute polymerization. Then, 552 g of 1,3-butadiene monomer were added to the reactor for another polymerization for 1 hour. Also, 124 g of styrene monomer were added for further polymerization for 30 minutes, followed by the addition of 1.5 g of t-butyl chloride to deactivate the terminal of polymer. Thus, a styrene-butadiene-styrene block copolymer, so obtained, had the following characteristics: 31.0% as a combined content of styrene (block styrene content: 30.0%), 38.5% as a combined 1,2 vinyl content of butadiene unit, and a number average molecular weight of about 50,000.

Workup

  1. custompolymerization

Sources & evidence

ORD record
ord-1204e18773a846a3bb6e020e8336b778
Source dataset
uspto-grants-2002_06
Patent number
US06410657B1

Reaction notes

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