Premium
Solvent Effect on β‐Hydride Elimination Reaction in Syndiospecific Styrene Polymerization with Cyclopentadienyltitanium Trichloride (CpTiCl 3 )/Methylalumoxane (MAO) Catalytic System
Author(s) -
Kawabe Masanao,
Murata Masahide
Publication year - 2001
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(20010701)202:11<2440::aid-macp2440>3.0.co;2-b
Subject(s) - polymerization , polymer chemistry , chemistry , solvent , styrene , polystyrene , hydride , dielectric , catalysis , metallocene , solvent effects , equilibrium constant , copolymer , organic chemistry , materials science , polymer , hydrogen , optoelectronics
The influence of the type of solvent on styrene polymerization behavior with cyclopentadienyltitanium trichloride (CpTiCl 3 ) and methylalumoxane (MAO) catalytic system at 25°C was investigated. It was found that the number‐average molecular weight ( M̄ n ) of the polystyrene produced was correlated with the dielectric constant of solvent (ε). The maximum M̄ n was obtained by using the solvents having proper dielectric constant at ε = 4.0–4.2. The kinetic analyses and 1 H NMR measurements strongly suggested that this solvent effect was induced by the decrease of rate constant of β‐hydride elimination (k tr β ). The correlation between the kinetic parameters and the dielectric constants of solvent suggests competitive equilibrium between coordination of solvent and β‐agostic interaction should exist.