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Keywords:

  • 1,3-butadiene;
  • anionic and Ziegler-Natta polymerizations;
  • ionic liquids

Abstract

Summary: The anionic and Ziegler-Natta polymerizations of 1,3-butadiene initiated with n-BuLi and NdV/TIBA/DEAC respectively were carried out in presence of ionic liquids and cyclohexane as solvent in both cases. Polybutadienes obtained were characterized by SEC, NMR and DSC techniques and results were compared with polybutadienes synthesized under similar conditions but in absence of ionic liquids. In all cases, the presence of ionic liquids caused a decrease in the reaction exothermal and also a diminution in the molecular weight distribution. The ionic liquids increased the microstructure cis-1,4 in both kind of polymerizations, and promotes a shift towards lower temperatures in the glass-transition temperature.