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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

MELLO, Ivana L.; SOARES, Bluma G.; COUTINHO, Fernanda M. B.  e  NUNES, Denise S. S.. Influence of ageing of neodymium based Ziegler-Natta catalyst on butadiene polymerization. Polímeros [online]. 2007, vol.17, n.1, pp.62-66. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14282007000100014.

Catalysts aged for different time periods (0, 5, 15, 40, 80 and 160 days) and different temperatures (10, 25 and 40 °C) were tested in the cis-1,4 polymerization of 1,3-butadiene. The catalytic activity and polymer characteristics (molecular weight and microstructure) were evaluated. The results showed that the catalyst ageing did not affect the polymer microstructure. The cis-1,4 content remained at 98%, trans-1,4 at 1,4% and vinyl units at 0,6%. However, the catalysts aged for 40 days produced polybutadienes with higher molecular weight. Also observed was a tendency to an increased polymerization conversion by the catalysts aged at 25 °C.

Palavras-chave : High-cis polybutadiene; Ziegler-Natta catalyst; neodymium; catalyst ageing.

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