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Study of Fracture Behavior of Polypropylene/MWCNT and Polypropylene/m-MMT Nanocomposites by Small Angle X-ray Scattering (SAXS)

Published online by Cambridge University Press:  31 January 2012

José. M. Mata-Padilla
Affiliation:
Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna 140 Saltillo Coahuila, México.
Carlos. A. Ávila-Orta
Affiliation:
Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna 140 Saltillo Coahuila, México.
Francisco. J. Medellín-Rodríguez
Affiliation:
CIEP-FCQ, UASLP., Av. Dr. Manuel Nava 6, Zona Universitaria, San Luis Potosí, S.L.P., 78210, México.
Janet. A. Valdéz-Garza
Affiliation:
Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna 140 Saltillo Coahuila, México.
Adriana Torres-Martínez
Affiliation:
CIEP-FCQ, UASLP., Av. Dr. Manuel Nava 6, Zona Universitaria, San Luis Potosí, S.L.P., 78210, México.
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Abstract

The fracture behavior of polypropylene (PP) and its composites was studied as a function of concentration of multiwall carbon nanotubes (MWCNT) and modified montmorillonite (m-MMT). SAXS and WAXS (Small/Wide Angle X-ray Scattering) techniques were used to monitor the morphological changes (i.e. nanocomposite structure and crystalline morphology) caused by various nanoparticle concentrations and polymer uniaxial stretching deformation. The effect of nanoparticle nature was also investigated. The mechanical analysis shows a great effect of nanoclay concentration on the PP deformation, while uniaxial stretching of the PP/MWCNT nanocomposites was less affected by carbon nanotubes concentration. The SAXS and WAXS analysis of stretched samples indicated that the pure polypropylene and nanocomposites with low nanoparticles concentrations (1 wt/wt%) developed a fracture governed by shear yielding mechanism, while PP nanocomposites with higher concentrations of carbon nanotubes and nanoclay showed a crazing and microcraking fracture mechanism. On the other hand, different chemical nature of MWCNT and m-MMT did not affect the fracture mechanism of polypropylene at low nanoparticles concentrations.

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Copyright
Copyright © Materials Research Society 2012

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Study of Fracture Behavior of Polypropylene/MWCNT and Polypropylene/m-MMT Nanocomposites by Small Angle X-ray Scattering (SAXS)
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