Styrene → Styrene-butadiene-styrene

HRID 1419274Notes

Reaction equation

HRID 1419274 reaction equation
[CH:1]([Li])([CH2:3][CH3:4])[CH3:2].CN(C)CCN(C)C.[CH2:14]=[CH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.C=CC=C>C1CCCCC1>[CH2:14]=[CH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.[CH2:2]=[CH:1][CH:3]=[CH2:4].[CH2:14]=[CH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Participants

6

Reactant 4

HCID 7501Styrene2×HCID 78451,3-ButadieneHCID 8037N,N,N',N'-TetramethylethylenediamineHCID 178418400CID 53628100

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent4×

Procedure

In a 5 l jacketed autoclave equipped with a stirrer were charged 1667 g of cyclohexane, 12.1 mmol of sec-butyl lithium, and 4.5 mmol of N,N,N',N'-tetramethylethylene-diamine, and 250 g of a 30 wt % cyclohexane solution of styrene was added thereto. Polymerization was carried out at 75° C. To the reaction system, a 30 wt % cyclohexane solution of 1167 g of 1,3-butadiene and 250 g of a 30 wt % cyclohexane solution of styrene were added thereto, and polymerization was continued to obtain an SBS (styrene-butadiene-styrene) terblock copolymer. Two percent of the sec-butyl lithium was deactivated with a trace water content, leaving 11.9 mmol of active lithium. To the resulting living polymer solution was added 12.37 mmol of ethanol to deactivate the polymer terminals.

Workup

  1. customequipped with a stirrer
  2. additionwas added
  3. customPolymerization
  4. customwas carried out at 75° C
  5. custompolymerization

Sources & evidence

ORD record
ord-acb806f601b7479a8742fe3d83797aeb
Source dataset
uspto-grants-1999_03
Patent number
US05886108

Reaction notes

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