Multi walled carbon nanotubes induced viscoelastic response of polypropylene copolymer nanocomposites: Effect of filler loading on rheological percolation |
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| Institution: | 1. Centre for Polymer Science & Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India;2. Department of Chemistry, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonepat 131039, India;1. Department of Materials Science and Engineering, Anadolu University (AU), Iki Eylul Campus, 26550, Eskisehir, Turkey;2. Institute for Carbon Composites, Technische Universität München (TUM), Faculty of Mechanical Engineering, Boltzmannstraße 15, D-85748, Garching, Germany;3. Composite Materials Manufacturing Science Laboratory (CMMSL), Research and Application Center of Civil Aviation (RACCA), Anadolu University (AU), Iki Eylul Campus, 26550, Eskisehir, Turkey;1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States;2. SABIC Technology Center, Sugar Land, TX 77478, United States;1. Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi, 110016, India;2. Department of Material Science of Technology, Indian Institute of Technology Delhi, New Delhi, 110016, India |
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| Abstract: | Polypropylene random copolymer nanocomposites having 0.2–7.0 vol% multi-walled carbon nanotubes (MWCNTs) were prepared via melt processing. Transmission electron microscopy (TEM) was employed to determine the nano scale dispersion of carbon nanotubes. Linear viscoelastic behavior of these nanocomposites was investigated using parallel plate rheometry. Incorporation of carbon nanotubes in the polymer matrix resulted in higher complex viscosity (η*), storage (G′) and loss modulus (G″) as compared to neat polymer, especially in the low-frequency region, suggesting a change from liquid to solid-like behavior in the nanocomposites. By plotting storage modulus vs. carbon nanotube loading and fitting with a power law function, the rheological percolation threshold in these nanocomposites was observed at a loading of ～0.27 vol% of MWCNTs. However, electrical percolation threshold was reported at ～0.19 vol% of MWCNTs loading. The difference in the percolation thresholds is understood in terms of nanotube connectivity with nanotubes and polymer chain required for electrical conductivity and rheological percolation. |
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| Keywords: | Rheology Percolation Polypropylene random copolymer Carbon nanotubes |
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