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Some aspects of anionic butadiene copolymerization
Author(s) -
Ying Shengkang
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940850119
Subject(s) - copolymer , monomer , reactivity (psychology) , chemistry , polymer chemistry , solvent , styrene , butyllithium , kinetics , organic chemistry , polymer , medicine , physics , alternative medicine , pathology , quantum mechanics
Abstract The relationship between ideal copolymerization behavior and the nature of reactive species in butyllithium (n‐BuLi) initiated anionic copolymerization of styrene (St)‐ butadiene (Bd) in nonpolar solvent has been discussed. The monomer reactivity ratios (m.r.r.) for various reactive species were evaluated by kinetic study and statistical approach (using 13 C NMR data) in St‐Bd anionic copolymerization system with THF as polar additive. The Markovian mechanisms for different propagating reactions in this complex copolymerizing system have been postulated. Furthermore, “pseudo” zero order Markovian mechnism could be sophisticatedly established in the n‐BuLi/tertiary amyloxy potassium (t‐AmOK)/THF initiated St‐Bd copolymerization system, provided that the apparent rate constants of both monomers are equal. Thus, by adjusting the ratio of K/Li and THF/Li, copolymers with composition almost identical to the ratio of initial monomer feed composition at different stages of conversion could be obtained.