Polymerization of methyl methacrylate with V(acac)3 and VOCl3 in combination with methylaluminoxane

✍ Scribed by Kiyoshi Endo; Akihiro Inukai; Takayuki Otsu

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 340 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021960625

✦ Synopsis

Abstract

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.