Styrene → Styrene

HRID 1291736Notes

Reaction equation

HRID 1291736 reaction equation
[CH2:1]1[CH2:6]CC[CH2:3][CH2:2]1.C([Li])CCC.[CH2:12]=[CH:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.C=CC=C>O1CCCC1>[CH2:12]=[CH:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[CH2:6]=[CH:1][CH:2]=[CH2:3].[CH2:12]=[CH:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[CH2:12]=[CH:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1

Participants

7

Reactant 4

HCID 7501StyreneHCID 78451,3-ButadieneHCID 8078CyclohexaneHCID 178418339Butyllithium

Product 2

HCID 7501StyreneHCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

In a 2 gallon autoclave reactor, 4,500 g of cyclohexane was charged. 9 g of tetrahydrofuran and 1.1 g of n-butyllithium were injected to the reactor, after which 225 g of styrene monomer and 525 g of 1,3-butadiene monomer both were simultaneously injected to the reactor and the resulting mixture was subjected to polymerization for 1 hr, to give a styrene-butadiene-styrene block copolymer with a number average molecular weight of about 60,000 in which styrene content amounted to 29% while the 1,2-vinyl bond content of butadiene unit amounted to 30.5%. The copolymer contained 1.67 mmol of living lithium per 100 g of the polymer.

Workup

  1. customthe resulting mixture was subjected to polymerization for 1 hr

Sources & evidence

ORD record
ord-c66ac6d80cdf4f84bdc15c90b5386065
Source dataset
uspto-grants-1998_05
Patent number
US05753778

Reaction notes

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