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Polímeros

versão impressa ISSN 0104-1428

Resumo

OLIVEIRA, Renato Jonas Benne de; SANTOS, Juliana da Silva  e  MARQUES, Maria de Fátima Vieira. Preparation of Ziegler-Natta catalysts for the synthesis of polypropylene/carbon nanotubes nanocomposites by in situ polymerization. Polímeros [online]. 2014, vol.24, n.spe, pp.13-19.  Epub 09-Maio-2014. ISSN 0104-1428.  https://doi.org/10.4322/polimeros.2014.051.

Aiming to improve the dispersion of carbon nanotubes (CNT) in a polymer matrix, a fourth-generation Ziegler-Natta, ZN, catalyst was prepared in the presence of CNT to synthesize nanocomposites of polypropylene (PP/CNT) by in situ polymerization. The performance of the ZN catalyst was evaluated along with the thermal (TGA and DSC) and dynamic-mechanical properties of the nanocomposites and they were compared with those of neat PP synthesized with the standard catalyst prepared without carbon nanoparticles. The thermal degradation temperature of the PP/CNT nanocomposite increased in comparison with that of neat PP. Moreover, the crystallization temperature and the degree of crystallinity sharply increased in PP/CNT materials. Finally, the storage modulus of the nanocomposite prepared by 30 min of polymerization increased, as well as the Tg.

Palavras-chave : Polypropylene; nanocomposite; in situ polymerization; carbon nanotubes; Ziegler-Natta.

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