Resumo

VALENCIA LOPEZ, Luis Alexandro et al. The Influence of co-catalyst in the Polymerization of 1,3-butadiene Catalyzed by Neodymium Chloride Tripentanolate. J. Mex. Chem. Soc [online]. 2016, vol.60, n.3, pp.141-147. ISSN 1870-249X.

Triisobutylaluminum (TIBA), triethylaluminum (TEA), diisobutylaluminum hydride (DIBAH) and methylaluminoxane (MAO) were evaluated as activators of neodymium chloride tripentanolate catalyst in order to investigate their influence over the catalytic activity, macro- and microstructure, and thermal properties of of resulting polybutadienes. The higher catalytic activities were achieved by TEA and TIBA as co-catalysts, whereas TIBA and DIBAH led to the polymers with highest cis-1,4 structure content with 98.4 and 97.3% respectively. The catalytic activity was remarkably poor with MAO as co-catalyst, as well as low stereocontrol. Number average molecular weight values were observed in the range of 260 to 720 kg/mol.

Palavras-chave : Coordination polymerization; catalyst system; neodymium; aluminum co-catalyst; 1,3-butadiene.

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