Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Kinetic Features of the Cobalt Dihalide/Methylaluminoxane Catalytic System in 1,3-Butadiene Polymerization

  • Nath Dilip Chandra Deb (Chemical Resources Laboratory, Tokyo Institute of Technology) ;
  • Fellows Christopher M. (School of Biological, Biomedical and Molecular Sciences, University of New England) ;
  • Shiono Takeshi (Chemical Resources Laboratory, Tokyo Institute of Technology)
  • Published : 2006.06.01
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Abstract

The kinetic features of polymerization with an active site comprising cobalt dihalides ($CoX_2$, where X=Cl, Br, I) activated by methylaluminoxane (MAO) were investigated in 1,3-butadiene polymerization. The catalytic system exhibited the characteristic features of living polymerization. The initiation ($k_i$) and propagation ($k_p$) rate coefficients were estimated using the kinetic model for slow initiation previously reported by Shiono et al. The energy of activation fur the propagation reaction was calculated to be 27-30 $kJmol^{-1}$. The marked changes in reaction rate observed with different halides could be adequately described in terms of variations in the initiation process, with the same Arrhenius curve fitting propagation rate coeffcients estimated from all three halides, suggesting that the halide does not participate in the growing chain end.

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References

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