Structural recovery mechanism after shear induced orientation of multiwalled carbon nanotube in polypropylene matrix |
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| Institution: | 1. Department of Railway Engineering, School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China;2. Department of Engineering and Technology, Trelleborg IAVS, Leicester, LE4 2BN, UK;3. Department of Automotive Engineering, Tsinghua University, Beijing, 100084, China;1. Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China;2. School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China;1. Institute of Continuous Media Mechanics UB RAS, Perm, Russia;2. Perm State University, Perm, Russia;3. Leibniz Institute of Polymer Research, Dresden, Germany;1. Department of Civil Engineering and Architecture, University of Catania, Italy;2. Department of Electrical, Electronics, and Informatics Engineering, University of Catania, Viale A. Doria, 6-95125 Catania, Italy;1. Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, M?egyetem rkp. 3., H-1111 Budapest, Hungary;2. MTA–BME Research Group for Composite Science and Technology, M?egyetem rkp. 3., H-1111 Budapest, Hungary;1. Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, P.O. Box 91, Hungary;2. Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1519 Budapest, P.O. Box 286, Hungary |
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| Abstract: | In this work the flow induced orientation and the governing mechanism of structural recovery of multi-walled carbon nanotube (MWCNT) filled polypropylene nanocomposites were investigated. A series of linear and nonlinear melt rheological measurements including stress growth and time sweep experiments were performed at different temperatures to study the structural breakdown, nanoparticles orientation, subsequent structural recovery and MWCNT loadings. The results showed that the structural recovery occurred in two stages. The first stage, initial agglomeration, showed a quick recovery which was independent of temperature, can be interpreted in terms of inter-particle van der Waals interactions. This structural recovery stage had major contribution in the storage modulus increment. The second stage of the recovery, secondary agglomeration, was slower and dependent on temperature, can be attributed to rotary diffusion of nanoparticles. This stage had minor contribution to the storage modulus increase. Storage modulus increment in both of these agglomeration was attributed to the increase of nanotube-nanotube contacts. Both of these stages were confirmed by transmission electron micrographs. These result were in a good agreement with those calculated using van der Waals and diffusion concepts. |
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| Keywords: | MWCNT Nanocomposites Orientation Structural recovery Agglomeration |
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