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Enhanced Structural Behavior of Systems Polypropylene-Carbon Nanotubes in Acidic Medium

Published online by Cambridge University Press:  10 February 2014

Felipe Avalos-Belmontes
Affiliation:
Universidad Autónoma de Coahuila, V. Carranza sn, 25000, Saltillo Coahuila, México
Miguel Flores-Godina
Affiliation:
Universidad Autónoma de Coahuila, V. Carranza sn, 25000, Saltillo Coahuila, México
Rosa Narro-Cespedes
Affiliation:
Universidad Autónoma de Coahuila, V. Carranza sn, 25000, Saltillo Coahuila, México
Adali Castañeda-Facio
Affiliation:
Universidad Autónoma de Coahuila, V. Carranza sn, 25000, Saltillo Coahuila, México
Martha Castañeda-Flores
Affiliation:
Universidad Autónoma de Coahuila, V. Carranza sn, 25000, Saltillo Coahuila, México
Maura Tellez-Rosas
Affiliation:
Universidad Autónoma de Coahuila, V. Carranza sn, 25000, Saltillo Coahuila, México
Luis Ramos-deValle
Affiliation:
Centro de Investigación en Química Aplicada, E Reyna sn, 25204, Saltillo Coahuila, México
Roberto Zitzumbo-Guzman
Affiliation:
Centro de Innovación Aplicada en Tecnologías Competitivas, México.
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Abstract

The effect of carbon nanotubes (CNTs) on the thermal and chemical stability of polypropylene (PP) when subjected to oxidation in a fuming nitric was evaluated. The effect of CNTs on the crystalline morphology and melting and crystallization temperature of PP was studied. The results shown a thermal stability increased markedly; the decomposition temperature, increased from 293°C for pure PP to 320°C for PP with CNTs. The crystallization temperature increased perceptibly in presence of CNTs. The oxidative degradation with nitric acid produced a reduction in molecular weight; however, this negative effect was less pronounced in the PP compositions with carbon nanoparticles. The morphological changes evaluated with X-ray diffraction showed that the alpha type crystallinity remains, irrespective of the nucleating agent, and the intensity ratios between reflections peaks was taken as an indication of an increasing nucleating efficiency.

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Copyright
Copyright © Materials Research Society 2014 

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