Premium
Polymerization of methyl methacrylate with V(acac) 3 and VOCl 3 in combination with methylaluminoxane
Author(s) -
Endo Kiyoshi,
Inukai Akihiro,
Otsu Takayuki
Publication year - 1995
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.1995.021960625
Subject(s) - methylaluminoxane , tacticity , polymer chemistry , methyl methacrylate , polymer , polymerization , dispersity , catalysis , chemistry , copolymer , materials science , metallocene , organic chemistry
The polymerization of methyl methacrylate (MMA) with V(acac) 3 and VOCl 3 in combination with methylaluminoxane (MAO) was investigated. The obtained polymers have a relatively narrow molecular weight distribution ( M̄ w / M̄ n < 1,5). It was found that the isotactic triad content of the polymers increases with increasing temperature and MAO/V and MAO/MMA mole ratios. The interaction between MMA and MAO has an influence on the tacticity of radically (initiator AIBN) obtained polymers: in presence of MAO the fraction of isotactic triads ( mm ) is higher. The catalytic activity of MAO‐containing catalysts (V(acac) 3 /MAO and VOCl 3 /MAO) was compared with that of AlEt 3 ‐containing catalysts (V(acac) 3 /AlEt 3 and VOCl 3 /AlEt 3 ). It was not much different, but for MAO as cocatalyst the isotacticity of the resulting PMMA's was higher, and the polydispersity lower, than with AlEt 3 as cocatalyst.