Effect of Carbon Nanotubes Content on the Structure and Photo-Oxidation Behaviors of Polypropylene

Abstract:

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Polypropylene (PP) nanocomposites with 0.1, 0.2, 0.5, 0.8, 1.0 and 2.0 wt% multi-walled carbon nanotubes (MW-CNTs) were prepared via meltcompounding in a twin-screw extruder followed by injection molding. The effects of MW-CNTs additions on the structure, mechanical and photo-oxidation behavior of PP were studied using X-ray diffraction (XRD), differential scanning calorimetry (DSC), tensile tests and FT-IR apparatus. XRD results showed that only α-PP crystals form in the PP/MW-CNTs composites. DSC results confirmed that the corporation of MW-CNTs enhanced the nucleation process on PP crystallization. Results of the tensile tests showed that before photo-oxidation, the tensile strengths of the samples increased with the increase of MW-CNTs contents when the MW-CNTs contents were less than 1% wt, whilst the tensile strength decreased at higher MW-CNTs contents (>1% wt). When subjected to photo-oxidation, the tensile strengths of the samples decreased with the increasing photo-oxidation time. The resistance to accelerated photo-oxidation of PP/MW-CNTs composites was also compared with the photo-oxidation behaviour of the original polypropylene sample. At short photo-oxidation time, such as under 250 h, the rates of carbonyl formation for the PP/MW-CNTs composites are similar to that observed for the original polypropylene but at longer photo-oxidation times the carbonyl formation increases for lower MW-CNTs contents (0.1, 0.2, 0.5 and 0.8% wt), and decreases for higher MW-CNTs contents (1 and 2% wt). It was found that the MW-CNTs showed both anti-degradation and pro-degradation effects at different concentrations.

Info:

Periodical:

Advanced Materials Research (Volumes 189-193)

Edited by:

Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang

Pages:

1222-1227

DOI:

10.4028/www.scientific.net/AMR.189-193.1222

Citation:

Y. Lian et al., "Effect of Carbon Nanotubes Content on the Structure and Photo-Oxidation Behaviors of Polypropylene", Advanced Materials Research, Vols. 189-193, pp. 1222-1227, 2011

Online since:

February 2011

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$35.00

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