Participants
| Role | Name | HCID | Charge |
|---|
| Reactant | Styrene | HCID 7501 | — |
| Reactant | 1,3-Butadiene | HCID 7845 | — |
| Reactant | Dibutyltin dichloride | HCID 12688 | — |
| Reactant | 2-Propanol, 2-methyl-, lithium salt (1:1) | HCID 23664764 | — |
| Solvent | Isopropanol | HCID 3776 | — |
| Solvent | Hexane | HCID 8058 | — |
| Solvent | Cyclohexane | HCID 8078 | — |
| Solvent | HCID 19351698 | HCID 19351698 | — |
| Product | Styrene-butadiene-styrene | HCID 22280236 | — |
Reaction Steps
A styrene-butadiene-styrene block polymer was prepared using the cyclic organomagnesium initiator, SBMG, as follows: To the reactor was charged 1.25 lbs. of 24.8% 1,3-butadiene in technical hexane and 3.1 lbs. of additional hexane, followed by 3.8 mM SBMG in styrene/hexane and 5.7 mM of lithium-t-butoxide in cyclohexane. The reactor was then heated to 60° C. and the reaction allowed to proceed for 4 hours. Then 180 grams of 33% styrene in hexane were added and polymerization proceeded for an additional hour. The coupling/functionalizing agent, 3.0 mM of dibutyl-tin-dichloride, was then added to the reactor. After one hour, the resulting polymer cement was isolated by coagulation in an equal volume of isopropanol containing BHT.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|
| Patent number | US05677399 |
|---|
| Source dataset | uspto-grants-1997_10 |
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| ORD ID | ord-b9049415fc854b849ac9449238a0a269 |
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| Source note | uspto-grants-1997_10 |
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