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Microscopic mechanism of reinforcement in single-wall carbon nanotube/polypropylene nanocomposite |
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| Authors: | T.E. Chang A. Kisliuk R. Pyrz |
| Affiliation: | [a] Department of Polymer Science, University of Akron, Akron, OH 44325, USA [b] Institute of Mechanical Engineering, Aalborg University, Aalborg East DK9220, Denmark [c] Department of Polymer Engineering, University of Akron, Akron, OH 44325, USA |
| Abstract: | We analyzed mechanical properties and structure of polypropylene fibers with different concentrations of single-wall carbon nanotubes (SWNTs) and draw down ratios (DDR). Tensile tests show a three times increase in the Young's modulus with addition of only 1 wt% SWNT, and much diminished increase of modulus with further increase in SWNT concentration. Microscopic study of the mechanism of reinforcement by SWNT included Raman spectroscopy and wide-angle X-ray diffraction (WAXD). The results show linear transfer of the applied stress from the polymer matrix to SWNT. Analysis of WAXD data demonstrates formation of a β-crystal phase in polypropylene matrix under the strain. |
| Keywords: | Carbon nanotubes Polypropylene Microscopic mechanism |
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