Styrene → Styrene-butadiene-styrene

HRID 1377886Notes

Reaction equation

HRID 1377886 reaction equation
[CH2:1]=[CH:2][CH:3]=[CH2:4].CC(C)([O-])C.[Li+].[CH2:11]=[CH:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>CCCCCC.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 3

HCID 7501StyreneHCID 78451,3-ButadieneHCID 236647642-Propanol, 2-methyl-, lithium salt (1:1)

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 2

HCID 8058HexaneSolvent3×HCID 8078CyclohexaneSolvent

Conditions

Temperature
75 °C

Procedure

A styrene-butadiene-styrene triblock polymer was prepared using the cycloorganomagnesium initiator, IMG, as follows: To the reactor was charged 175 grams of 1,3-butadiene in 1800 grams technical hexane, followed by 4.8 mM IMG in hexane and 7.2 mM of lithium-t-butoxide in cyclohexane. The reactor was then heated to 75° C. and the reaction allowed to proceed for 4 hours. Then 226 grams of 33% styrene in hexane were added and polymerization proceeded at 90° C. for an additional hour. The reaction was then terminated by dropping the resulting polymer cement into an equal volume of isopropanol. The polymer was then isolated by precipitation after the addition of the drum-dried.

Workup

  1. custompolymerization
  2. waitproceeded at 90° C. for an additional hour
  3. customThe reaction was then terminated
  4. customThe polymer was then isolated by precipitation
  5. additionafter the addition of the drum-dried

Sources & evidence

ORD record
ord-c568b04016d646648b479650b4e87d26
Source dataset
uspto-grants-1997_09
Patent number
US05665827

Reaction notes

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