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

HRID 2164317Notes

Reaction equation

HRID 2164317 reaction equation
[CH:1]([Li])([CH2:3][CH3:4])[CH3:2].[CH2:6]=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.C=CC=C>C1CCCCC1>[CH2:6]=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.[CH2:2]=[CH:1][CH:3]=[CH2:4]

Participants

5

Reactant 3

HCID 7501StyreneHCID 78451,3-ButadieneHCID 178418400CID 53628100

Product 1

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

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Procedure

A one gallon reactor containing 2,000 g. of purified cyclohexane was readied for polymerization of monomer as in Example I. Into the closed reactor was charged 8.86 m moles of sec-butyllithium and 132.9 of styrene and the reactor held at 60° C. for 20 minutes. The Mn was 15,000 for the resulting polystyrene blocks. At this point, 132.9 g. of butadiene were added and the whole mixture held at 60° C. for 75 minutes to form diblock arms of 50/50 wt-% styrene/butadiene and having average Mn of 30,000. There was then added either 17.72 m moles (coupling agent/RLi=2), 26.58 m moles (coupling agent/RLi=3), 35.44 m moles (coupling agent/RLi=4), or 53.16 m moles (coupling agent/RLi=6), of the desired linking agent and the temperature held at 30° C. to complete the linking reaction. After termination and separation of the polymeric product the results shown in Table I were obtained for unlinked diblock (DB), linked triblock (TB) and starblock.

Workup

  1. additionA one gallon reactor containing 2,000 g
  2. waitthe whole mixture held at 60° C. for 75 minutes

Sources & evidence

ORD record
ord-84337175e5db4a1195f07a00191098d6
Source dataset
uspto-grants-1985_03
Patent number
US04503188

Reaction notes

Loading…