Impact behaviour of polypropylene filled with multi-walled carbon nanotubes |
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Authors: | Hui Zhang Zhong Zhang |
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Affiliation: | a National Center for Nanoscience and Technology, China, 100080 Beijing, China b Institute for Composite Materials, University of Kaiserslautern, 67663 Kaiserslautern, Germany |
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Abstract: | Multi-walled carbon nanotubes/polypropylene composites were compounded using a twin-screw extruder. Here, nanotubes with different lengths, i.e. 1-2 μm and 5-15 μm, respectively, were applied at a constant volume content of 1%. Notched Charpy impact tests showed that toughening effects of nanotubes depended highly on testing temperatures. The impact resistance was notably enhanced at a temperature above the glass transition temperature of matrix. Longer nanotubes performed more effective in toughening compared to the shorter ones. The increment of impact resistance of nanotube-filled polypropylene was considered due to enhanced load-carrying capability and much-increased deformation of matrix. SEM fractography further revealed the toughening mechanisms in a micro-scale. The impact energy was improved via nanotube breakage and pullout, which likely led to a series of energy consuming actions. In addition, the smaller spherulite size induced by nanotubes would be favourable to the impact resistance partially. |
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Keywords: | Multi-walled carbon nanotubes Polymer nanocomposites Impact resistance Polypropylene |
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