Styrene → Styrene

HRID 1829859Notes

Reaction equation

HRID 1829859 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[Li:9][CH2:10][CH2:11][CH2:12][CH3:13].[CH2:14]=[CH:15][CH:16]=[CH2:17]>>[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:10]=[CH:11][CH:12]=[CH2:13].[CH:15]([Li:9])([CH2:16][CH3:17])[CH3:14]

Participants

6

Reactant 3

HCID 7501Styrene3×HCID 78451,3-ButadieneHCID 178418339Butyllithium

Product 3

HCID 7501StyreneHCID 78451,3-ButadieneHCID 178418400CID 53628100

Procedure

After a first addition of styrene, the mixture was polymerized for 15 minutes. A second addition of initiator (s.-BuLi 2) was made to initiate new polymer chains, and further styrene was added in portions to continue block build-up. The reaction time for build-up of a styrene block was 15 minutes, and that for a butadiene block was 40 minutes. The polymerization was terminated by adding 3 mL of isopropanol. 0.1% by weight of Kerobit TBK (2,6-di-tert-butyl-p-cresol), based on the solids content of the block copolymer, was added for stabilization. Table 4 gives the amounts of styrene, butadiene, and sec-butyllithium used in each of the stages, and also gives the properties of the resultant block copolymer mixtures.

Workup

  1. customthe mixture was polymerized for 15 minutes
  2. additionwas added in portions
  3. customThe polymerization was terminated
  4. additionby adding 3 mL of isopropanol
  5. additionwas added for stabilization

Sources & evidence

ORD record
ord-f0c97915fc6d430483544f9924aab112
Source dataset
uspto-grants-2006_06
Patent number
US07064164B2

Reaction notes

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