Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

HRID 380667Notes

Reaction equation

HRID 380667 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.C=CC=C.C([Li])(CC)C.C([Mg]CCCC)CCC>C1CCCCC1.CCCCCC.C(O)C.CO>[CH2:1]=[CH:2][CH:3]=[CH2:4].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

9

Reactant 4

HCID 7501StyreneHCID 78451,3-ButadieneHCID 178418400CID 53628100HCID 178448196HCID 178448196, compound

Product 1

HCID 62697Benzene, ethenyl-, polymer with 1,3-butadiene

Reagents, catalysts & solvents 4

HCID 702EthanolSolventHCID 887MethanolSolventHCID 8058HexaneSolventHCID 8078CyclohexaneSolvent

Procedure

920 g of styrene, 80 g of butadiene, and a premixed catalyst solution comprising 0.1 ml of a 1 molar s-butyllithium solution in cyclohexane and 0.6 ml of a 1 molar dibutylmagnesium solution in n-hexane were added simultaneously over a period of one hour to a 2 l stirred reactor and polymerized at 70° C. The reaction mixture was held at 70° C. beyond the color change from yellow to red. At a solids content of 9.6% by weight, the reaction was stopped using 1 ml of a 1:1 mixture of methanol and ethanol. This gave a viscous solution of a butadiene-styrene block copolymer having a residual butadiene content of 1720 ppm and a molecular weight of Mn=137,000.

Workup

  1. additionwere added simultaneously over a period of one hour to a 2 l
  2. custompolymerized at 70° C
  3. customwas held at 70° C. beyond the color change

Sources & evidence

ORD record
ord-2a57ce64b81e40fc920cd6a61ebc9abe
Source dataset
uspto-grants-2001_10
Patent number
US06303721B1

Reaction notes

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