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- Living_anionic_polymerization abstract "Living anionic polymerization is a living polymerization technique involving an anionic propagating species.Living anionic polymerization was demonstrated by Szwarc and co workers in 1956. Their initial work was based on the polymerization of styrene and dienes. One of the remarkable features of living anionic polymerization is that the mechanism involves no formal termination step. In the absence of impurities, the carbanion would still be active and capable of adding another monomer. The chains will remain active indefinitely unless there is inadvertent or deliberate termination or chain transfer. This gave rise to two important consequences: The number average molecular weight, Mn, of the polymer resulting from such a system could be calculated by the amount of consumed monomer and the initiator used for the polymerization, as the degree of polymerization would be the ratio of the moles of the monomer consumed to the moles of the initiator added. , where Mo = formula weight of the repeating unit, [M]o = initial concentration of the monomer, and [I] = concentration of the initiator. All the chains are initiated at roughly the same time. The final result is that the polymer synthesis can be done in a much more controlled manner in terms of the molecular weight and molecular weight distribution (Poisson distribution).The following experimental criteria have been proposed as a tool for identifying a system as living polymerization system. Polymerization until the monomer is completely consumed and until further monomer is added. Constant number of active centers or propagating species. Poisson distribution of molecular weight Chain end functionalization can be carried out quantitatively.However, in practice, even in the absence of terminating agents, the concentration of the living anions will reduce with time due to a decay mechanism termed as spontaneous termination.".
- Living_anionic_polymerization thumbnail Triblock_copolymer_-_reaction_scheme.png?width=300.
- Living_anionic_polymerization wikiPageExternalLink abstract).
- Living_anionic_polymerization wikiPageExternalLink abstract.
- Living_anionic_polymerization wikiPageID "22967323".
- Living_anionic_polymerization wikiPageRevisionID "603290245".
- Living_anionic_polymerization hasPhotoCollection Living_anionic_polymerization.
- Living_anionic_polymerization subject Category:Polymerization_reactions.
- Living_anionic_polymerization type ChemicalProcess113446390.
- Living_anionic_polymerization type ChemicalReaction113447361.
- Living_anionic_polymerization type NaturalProcess113518963.
- Living_anionic_polymerization type PhysicalEntity100001930.
- Living_anionic_polymerization type PolymerizationReactions.
- Living_anionic_polymerization type Process100029677.
- Living_anionic_polymerization comment "Living anionic polymerization is a living polymerization technique involving an anionic propagating species.Living anionic polymerization was demonstrated by Szwarc and co workers in 1956. Their initial work was based on the polymerization of styrene and dienes. One of the remarkable features of living anionic polymerization is that the mechanism involves no formal termination step. In the absence of impurities, the carbanion would still be active and capable of adding another monomer.".
- Living_anionic_polymerization label "Living anionic polymerization".
- Living_anionic_polymerization sameAs m.0ch0x_5.
- Living_anionic_polymerization sameAs Q6659375.
- Living_anionic_polymerization sameAs Q6659375.
- Living_anionic_polymerization sameAs Living_anionic_polymerization.
- Living_anionic_polymerization wasDerivedFrom Living_anionic_polymerization?oldid=603290245.
- Living_anionic_polymerization depiction Triblock_copolymer_-_reaction_scheme.png.
- Living_anionic_polymerization isPrimaryTopicOf Living_anionic_polymerization.
