This paper describes the effect of multi-wall carbon nanotubes (MWCNTs) on the morphological organization of irradiated syndiotactic polypropylene films. The resistance to accelerated photooxidation of (sPP/MWCNTs) films crystallized at 100 °C was compared to the photooxidation behavior of unfilled sPP films with the same structural organization. UV radiation completely destroys the spherulitic morphology of the unfilled sample; in the irradiated sample the spherulites are completely absent after 48 hours of UV irradiation and we also observe the damages of the UV radiation (fig. 4). The degradation is more marked in some regions where the radiation causes extended microcracks along the sample. Atomic force microscopy (AFM) analysis shows that the MWCNTs prevent the development and propagation of the cracks caused by the radiative treatment on the un-filled sample. The same UV treatment highlights a strong stabilizing effect in the sample with different concentrations of MWCNT. The high concentration of defects found in the crystal structure of the nanofilled samples determines a decrease of the crystallite sizes as a consequence of the radiative treatments. All the evidence points to a blocking effect of the chain breakings due to the good dispersion of MWCNTs. This strong stabilizing effect against UV irradiation is also achieved by incorporating a very low concentration of MWCNTs.

Effect of multiwall carbon nanotubes on the morphology of irradiated syndiotactic polypropylene

RAIMONDO, MARIALUIGIA;GUADAGNO, Liberata;NADDEO, Carlo
2011-01-01

Abstract

This paper describes the effect of multi-wall carbon nanotubes (MWCNTs) on the morphological organization of irradiated syndiotactic polypropylene films. The resistance to accelerated photooxidation of (sPP/MWCNTs) films crystallized at 100 °C was compared to the photooxidation behavior of unfilled sPP films with the same structural organization. UV radiation completely destroys the spherulitic morphology of the unfilled sample; in the irradiated sample the spherulites are completely absent after 48 hours of UV irradiation and we also observe the damages of the UV radiation (fig. 4). The degradation is more marked in some regions where the radiation causes extended microcracks along the sample. Atomic force microscopy (AFM) analysis shows that the MWCNTs prevent the development and propagation of the cracks caused by the radiative treatment on the un-filled sample. The same UV treatment highlights a strong stabilizing effect in the sample with different concentrations of MWCNT. The high concentration of defects found in the crystal structure of the nanofilled samples determines a decrease of the crystallite sizes as a consequence of the radiative treatments. All the evidence points to a blocking effect of the chain breakings due to the good dispersion of MWCNTs. This strong stabilizing effect against UV irradiation is also achieved by incorporating a very low concentration of MWCNTs.
2011
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/3036237
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