Preparation of Ziegler-Natta catalysts for the synthesis of polypropylene/carbon nanotubes nanocomposites by in situ polymerization
Oliveira, Renato Jonas B. de; Santos, Juliana da Silva; Marques, Maria de Fátima V.
http://dx.doi.org/10.4322/polimeros.2014.052
Polímeros: Ciência e Tecnologia, vol.24, nEspecial, p.13-19, 2014
Abstract
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.
Keywords
Polypropylene, nanocomposite, in situ polymerization, carbon nanotubes,
Ziegler-Natta
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