6533b82efe1ef96bd129456c
RESEARCH PRODUCT
false
Hartwig HöckerV. WarzelhanG. V. Schulzsubject
Kinetic chain lengthchemistry.chemical_compoundAnionic addition polymerizationBulk polymerizationChemistryPolymer chemistryPrecipitation polymerizationDegree of polymerizationMethyl methacrylatePhotochemistryIonic polymerizationLiving anionic polymerizationdescription
Using a bifunctional initiator such as the tetrameric dianion of α-methylstyrene for the anionic polymerization of methyl methacrylate the rate constant is found to increase with conversion approaching that observed with a monofunctional initiator while the tacticity of the polymers obtained changes from that of an almost ideally atactic to a highly syndiotactic polymer. The results are explained by the assumption of an intramolecular association of the two terminal ion pairs yielding a new active species and gradually dissociating with increasing degree of polymerization of the chain. Using a polymeric dianion of α-methylstyrene as an initiator the association phenomenon is not observed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1980-01-01 | Die Makromolekulare Chemie |