Styrene → Styrene-butadiene-styrene

HRID 376475

Reaction equation

HRID 376475 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>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

6

Reactant 4

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

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

In a 2 gallon autoclave reactor, 4,500 g of cyclohexane was placed. 9 g of tetrahydrofuran, 112.5 g of styrene monomer and 1.7 g of n-butyllithium were charged into the reactor and then the reaction mixture wsa subjected to polymerization for 1 hour. Thereafter, 525 g of 1,3-butadiene monomer were injected into the reactor to polymerize for one hour. Finally, 112.5 g of styrene monomer was added and then polymerized for one hour to obtain styrene-butadiene-styrene living block copolymer with a number average molecular weight of about 50,000 which had styrene content of 30.87% (block styrene content of 30.1%) and 1,2-vinyl bond content of 41.31% (28.9% when reduced into whole polymer). Living lithium in the polymer was present in an amount of 2.00 mmol per 100 g of polymer.

Workup

  1. customthe reaction mixture wsa subjected to polymerization for 1 hour
  2. customto polymerize for one hour
  3. custompolymerized for one hour

Sources & evidence

ORD record
ord-dd4bf6a6a48d4bf8b91e4952b84be5a8
Source dataset
uspto-grants-2000_02
Patent number
US06020439

Linked notes

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