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

HRID 1256931Notes

Reaction equation

HRID 1256931 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.C([Li])CCC.C=CC=C>C1CCCCC1>[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

5

Reactant 3

HCID 7501Styrene2×HCID 78451,3-Butadiene2×HCID 178418339Butyllithium

Product 1

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

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Conditions

Temperature
58 °C

Procedure

A polymer solution of polystyrene-polybutadiene block copolymer 2b was prepared as follows. 1885 grams of cyclohexane (with 120ppm THF) solvent was added into a 5-liter autoclave and heated to 58° C. 89.0 grams of styrene monomers and 4.2 grams of 15 wt.% n-butyl lithium were added sequentially to start polymerization. While the styrene monomers were almost completely reacted, 218grams of butadiene monomers were added to continue polymerization until the butadiene monomers were almost completely reacted. The reaction was terminated by adding 1.27 grams of water. 0.7 phr of antioxidant (mixture of phosphite series Irgafos 126 and phenolic series Irganox 1076 antioxidants) was added following by well stirring, and thus the polymer solution of the polystyrene - polybutadiene block copolymer 2b was obtained.

Workup

  1. custompolymerization
  2. customwere almost completely reacted
  3. customThe reaction was terminated
  4. additionby adding 1.27 grams of water
  5. addition0.7 phr of antioxidant (mixture of phosphite series Irgafos 126 and phenolic series Irganox 1076 antioxidants)
  6. additionwas added

Sources & evidence

ORD record
ord-ac280491bc5e4e42ba528983b0232d45
Source dataset
uspto-grants-2013_06
Patent number
US08461246B2

Reaction notes

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