Premium
Study on the mechanism of anionic polymerization with mixed RLi‐R′OK initiators, 2. Theoretical study of random styrene‐butadiene copolymerization
Author(s) -
Litvinenko Galina I.,
ArestYakubovich Alexander A.
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20001101)201:17<2417::aid-macp2417>3.0.co;2-t
Subject(s) - copolymer , polymer chemistry , chemistry , polymerization , styrene , monomer , anionic addition polymerization , organic chemistry , polymer
Styrene‐butadiene copolymerization using mixed RLi‐R′OK initiators was modelled on the basis of a traditional two‐state scheme which supposes separate polymerization via lithium and potassium active species accompanied by a fast exchange of their counter‐ions. Copolymer composition and the monomer‐copolymer composition curves were calculated with respect to the influence of the K/Li ratio. Furthermore, the influence of the initial RLi concentration on the K/Li ratio for an azeotropic copolymerization was investigated. None of the proposed relations were found to agree with the published experimental data. Therefore, similar to butadiene homopolymerization, styrene‐butadiene copolymerization using an alkyllithium – potassium alkoxide initiator can be rather explained by an one‐state polymerization process under the participation of complex bimetallic centres than by a two‐state process via individual organometallic compounds.