Styrene → Styrene-butadiene-styrene

HRID 615905Notes

Reaction equation

HRID 615905 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:9]([Li])[CH2:10][CH2:11][CH3:12].C=CC=C>C1CCCCC1>[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:9]=[CH:10][CH:11]=[CH2:12].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

5

Reactant 3

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

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Conditions

Temperature
60 °C

Procedure

In an autoclave, 400 g of cyclohexane, 15 g of styrene monomer, and 0.11 g of n-butyl lithium were placed and then heated at 60° C. for three hours to polymerize the monomers. Subsequently, the resultant reaction solution and 70 g of 1,3-butadiene monomer newly added thereto were heated at 60° C. for three hours to induce polymerization of the monomers. Finally, the resultant reaction solution and 15 g of styrene monomer added thereto were heated at 60° C. for three hours. Consequently, there was obtained a styrene-butadiene-styrene type living block copolymer having a bound styrene content of 30%, a block styrene content of 29.5%, a 1,2-vinyl bond content of 13% in the butadiene units (9% based on the total of polymer), and a number-average molecular weight of about 60,000. This polymer contained 1.65 millimoles of living lithium per 100 g of the polymer.

Workup

  1. customto polymerize the monomers
  2. additionnewly added
  3. temperaturethereto were heated at 60° C. for three hours
  4. custompolymerization of the monomers
  5. additionadded
  6. temperaturethereto were heated at 60° C. for three hours

Sources & evidence

ORD record
ord-c841aba2afe144058cdfa9bc6eb1d5ff
Source dataset
uspto-grants-1985_02
Patent number
US04501857

Reaction notes

Loading…