Styrene → Styrene-butadiene-styrene

HRID 713166Notes

Reaction equation

HRID 713166 reaction equation
[CH2:1]([Li])[CH2:2][CH2:3][CH3:4].O1CCCC1.[CH2:11]=[CH:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.C=CC=C>C1CCCCC1>[CH2:11]=[CH:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.[CH2:1]=[CH:2][CH:3]=[CH2:4].[CH2:11]=[CH:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1

Participants

6

Reactant 4

HCID 7501Styrene2×HCID 78451,3-ButadieneHCID 8028TetrahydrofuranHCID 178418339Butyllithium

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Procedure

The 5400 g of cyclohexane, 7.4 millimoles of n-butyl lithium and 252 millimoles of tetrahydrofuran (THF) were charged in 10 L of a heater equipped with a stirrer. Then, 96 g of styrene was added and the polymerization was conducted at 45° C. Then, after the polymerization, the 400 g of 1,3-butadiene was added for the reaction. After the reaction, 96 g of styrene was added for the further polymerization, and the solution was placed inside the tank sealed with nitrogen. The above same polymerization steps were repeated and the reactants were placed inside the same tank sealed with nitrogen. After mixing, an SBS (styrene-butadiene-styrene) tri-block copolymer solution with solid content of 9.7% and weight average molecular weight of 230,000 can be obtained.

Workup

  1. customequipped with a stirrer
  2. customwas conducted at 45° C
  3. customThen, after the polymerization
  4. additionwas added for the further polymerization
  5. customsealed with nitrogen
  6. customThe above same polymerization steps
  7. customsealed with nitrogen
  8. additionAfter mixing

Sources & evidence

ORD record
ord-0d3cd84da6e24b0c9ed574f4b5fc03c2
Source dataset
uspto-grants-2015_11
Patent number
US09181356B2

Reaction notes

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