Preparation of Ziegler-Natta catalysts for the synthesis of polypropylene/carbon nanotubes nanocomposites by in situ polymerization
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.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Associação Brasileira de Polímeros
2014
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| Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282014000700004 |
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