Styrene → Styrene-butadiene-styrene

HRID 2188045Notes

Reaction equation

HRID 2188045 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>CC(C)=O.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

7

Reactant 4

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

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 2

HCID 180AcetoneSolventHCID 8028TetrahydrofuranSolvent

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 0.9 g of acetone 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-81789e2dc92443ea81fc08c51b6eab17
Source dataset
uspto-grants-2002_06
Patent number
US06410657B1

Reaction notes

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