Mechanical reinforcement in natural rubber/organoclay nanocomposites |
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| Authors: | Giorgio Ramorino Fabio Bignotti Stefano Pandini Theonis Riccò |
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| Affiliation: | 1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China;2. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China;3. Beijing Engineering Research Center of Advanced Elastomers, Beijing University of Chemical Technology, Beijing 100029, PR China;1. The Jan Kochanowski University, Management of Environment Protection and Modelling, Poland;2. Technical University of ?ód?, Institute of Polymer and Dye Technology, Poland;1. University of Twente, Elastomer Technology & Engineering, P.O. Box 217, 7500 AE Enschede, The Netherlands;2. Malaysian Rubber Board, RRIM Research Station, Sg. Buloh, 47000 Selangor, Malaysia;1. Beijing Key Laboratory of Novel Thin Film Solar Cells, North China Electric Power University, Beijing, 102206, China;2. Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing, 102206, China;1. Department of Chemistry, Faculty of Science, Mahidol University, Rama VI Road, Rajdhevee, 10400 Bangkok, Thailand;2. Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, D-01069 Dresden, Germany;3. Tampere University of Technology, Korkeakoulunkatu 16, Fi-33101 Tampere, Finland;4. Technische Universität Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany;5. Rubber Technology Research Centre, Faculty of Science, Mahidol University, Salaya Campus, Phutthamonthon IV Road, Salaya, 73170 Nakhonpathom, Thailand |
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| Abstract: | ![]()
Aim of this work is to get an insight into the mechanisms by which nanofillers produce mechanical reinforcement in polymers above their glass transition temperature. To this purpose, the mechanical behaviour of natural rubber/organo-modified montmorillonite vulcanisates produced by melt mixing with various filler contents was investigated. Data of the initial modulus, evaluated from stress–elongation curves obtained in tensile tests carried out at room temperature and a fixed cross-head rate, were analysed as a function of the organoclay content by applying mechanical models proposed in the literature. Such analysis provided an evaluation of the filler percolation threshold. Further, tests performed with varying temperature and rate pointed out appreciable rate and temperature dependence only for samples containing amounts of organoclay higher than the percolation limit, that is in presence of filler networking. Such a typical viscoelastic behaviour associated to the presence of the filler network contributes to support the hypothesis that in filled rubbers the mechanisms of filler networking is based on the formation of confined regions of immobilised polymer that join the filler particles of the network, as recently proposed. |
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