Free-volume correlation with mechanical and dielectric properties of natural rubber/multi walled carbon nanotubes composites |
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| Affiliation: | 1. Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar;2. Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;3. UGC-DAE-CSR Node, Kokilamedu 603103, Tamil Nadu, India;4. Ultra High Voltage Research Laboratory, Central Power Research Institute, Hyderabad 500098, India;5. School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India;1. Department of Materials Science and Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151-742, Republic of Korea;2. Composite Materials Research Group, Korea Institute of Materials Science, Changwon 641-010, Republic of Korea;3. Department of Materials Science and Engineering, Korea University, Seoul 136-701, Republic of Korea;1. Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea;2. Materials Development Team, Daeheung Rubber & Technology Co., Kimhae 621-884, Republic of Korea;1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China;3. Beijing Engineering Research Center of Advanced Elastomers, Beijing University of Chemical Technology, Beijing 100029, China;1. Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, D-01069 Dresden, Germany;2. Technische Universität Dresden, Institut für Werkstoffwissenschaft, D-01069 Dresden, Germany;3. Technical University of Tampere, Korkeakoulunkatu 16, Fi-33101 Tampere, Finland |
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| Abstract: | The microstructure, mechanical strength, dielectric properties, Doppler broadening measurements and positron life time studies of the composites containing multi walled carbon nanotubes (MWCNTs) and natural rubber (NR) are investigated. The uniform distribution of MWCNTs in the elastomer medium is studied by Raman spectroscopy and the electron microscopy images show the composite’s internal microstructure. Free volume sizes and interstitial mesopore sizes of the nanocomposites are determined by positron annihilation lifetime spectroscopy (PALS). PALS investigates the influence of the nanotubes in regulating the interphase nanoscale character. Strong interfacial interaction causes an apparent reduction of the free-volume fraction of NR probably by depressing the formation of free-volume holes in the interfacial region. The mechanical percolation and percolation observed from the dielectric measurements are correlated with the life time values. It is established that the sub-nano level free volumes and nano level structure of the composites have significant roles in regulating the mechanical properties. |
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| Keywords: | A. Nano-structures A. Polymer-matrix composites (PMCs) B. Electrical properties D. Mechanical testing |
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