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Living Polymerization by Bis(phenolate) Zirconium Catalysts: Synthesis of Isotactic Polystyrene‐ block ‐Polybutadiene Copolymers
Author(s) -
Hohberger Christiane,
Spaniol Thomas P.,
Okuda Jun
Publication year - 2014
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/macp.201400169
Subject(s) - polybutadiene , copolymer , tacticity , polymer chemistry , polystyrene , zirconium , materials science , polymerization , styrene , polymer , catalysis , living polymerization , chemistry , radical polymerization , organic chemistry , composite material , metallurgy
A thermally robust zirconium catalyst containing a tetradentate bis(phenolate) ligand of the (OSSO)‐type polymerizes styrene and butadiene in living fashion. The activity follows the order Zr > Hf > Ti. Low polydispersities of the resulting isotactic polystyrenes (PD < 1.10) can be achieved at room temperature, while butadiene is polymerized at temperatures as high as 90 °C to give predominantly trans ‐1,4‐polymer. This allows efficient preparation of isotactic polystyrene‐ block ‐polybutadiene copolymers (iPS‐ b ‐PBD).