The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
G. Unnikrishnan - One of the best experts on this subject based on the ideXlab platform.
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Barrier properties of natural rubber/ethylene vinyl acetate/carbon black composites
Journal of Materials Science, 2005Co-Authors: Athiyanathil Sujith, G. UnnikrishnanAbstract:Composites based on natural rubber (NR), ethylene vinyl acetate (EVA) and carbon black were prepared. Three types of carbon black viz.; semireinforcing furnace (SRF), high-abrasion furnace (HAF) and intermediate superabrasion furnace (ISAF) were used for reinforcement. The barrier properties of these filled samples were examined in an atmosphere of petrol, kerosene and diesel. Blends loaded with ISAF exhibited the lowest liquid uptake which has been attributed to the Higher Filler reinforcement and crosslink density of the matrix. Among the three vulcanising systems used, viz.; sulphur (S), dicumyl peroxide (DCP) and mixed (S+DCP), DCP crosslinked samples exhibited high barrier properties to the probe molecules. Diesel showed the lowest interaction with the composites compared to petrol and kerosene. The sorption data were used to estimate the enthalpy, entropy and free energy of the transport process.
Mikael Rigdahl - One of the best experts on this subject based on the ideXlab platform.
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effect of carbon black on electrical and rheological properties of graphite nanoplatelets poly ethylene butyl acrylate composites
Express Polymer Letters, 2015Co-Authors: Henrik Oxfall, Giampaolo Ariu, Thomas Gkourmpis, Rodney Rychwalski, Mikael RigdahlAbstract:© BME-PT. The effect of adding carbon black on the electrical and rheological properties of graphite nanoplatelets/poly(ethylene- butyl acrylate) copolymer composites produced via melt or solution mixing was studied. By adding a small amount of low- or high-structured carbon black to the nanocomposite, the electrical percolation threshold decreased and the final conductivity (at Higher Filler contents) increased. The effect on the percolation threshold was significantly stronger in case of the high-structured carbon black where replacing 10 wt% of the total Filler content with carbon black instead of graphite nanoplatelets reduced the electrical percolation threshold from 6.9 to 4.6 vol%. Finally, the solution mixing process was found to be more efficient leading to a lower percolation threshold. For the composites containing high-structured carbon black, graphite nanoplatelets and their hybrids there was a quite reasonable correlation between the electrical and rheological percolation thresholds.
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Effect of carbon black on electrical and rheological properties of graphite nanoplatelets/poly(ethylene-butyl acrylate) composites
Express Polymer Letters, 2015Co-Authors: Henrik Oxfall, Giampaolo Ariu, Thomas Gkourmpis, Rodney Rychwalski, Mikael RigdahlAbstract:© BME-PT. The effect of adding carbon black on the electrical and rheological properties of graphite nanoplatelets/poly(ethylene- butyl acrylate) copolymer composites produced via melt or solution mixing was studied. By adding a small amount of low- or high-structured carbon black to the nanocomposite, the electrical percolation threshold decreased and the final conductivity (at Higher Filler contents) increased. The effect on the percolation threshold was significantly stronger in case of the high-structured carbon black where replacing 10 wt% of the total Filler content with carbon black instead of graphite nanoplatelets reduced the electrical percolation threshold from 6.9 to 4.6 vol%. Finally, the solution mixing process was found to be more efficient leading to a lower percolation threshold. For the composites containing high-structured carbon black, graphite nanoplatelets and their hybrids there was a quite reasonable correlation between the electrical and rheological percolation thresholds.
Sonia Marli Bohrz Nachtigall - One of the best experts on this subject based on the ideXlab platform.
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Effect of commercial clays on the properties of SEBS/PP/oil thermoplastic elastomers. Part 1. Physical, mechanical and thermal properties
Applied Clay Science, 2015Co-Authors: Hugo Mauricio Tiggemann, Vanda Ferreira Ribeiro, Fabrício Celso, Sonia Marli Bohrz NachtigallAbstract:Abstract Thermoplastic elastomers based on SEBS/PP/oil blends show good flexibility at low temperatures, allowing complex shapes molding with good finishing. In this study, three different commercially available clays were used as Fillers in these blends through melt mixing processes to produce clay polymer nanocomposites (CPN) with improved thermal and mechanical properties. The physicomechanical properties, melt flow index, density and thermal stability of the materials were studied. It was found that optimum concentration was 2 phr for all Fillers. At this concentration, the mechanical properties reached a maximum while Higher Filler loading proved to be less beneficial. CPN prepared with Novaclay, a Brazilian clay organically modified with silane, showed the best properties, reaching 60% increase of mechanical resistance in comparison to the non-modified TPE matrix.
Athiyanathil Sujith - One of the best experts on this subject based on the ideXlab platform.
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Barrier properties of natural rubber/ethylene vinyl acetate/carbon black composites
Journal of Materials Science, 2005Co-Authors: Athiyanathil Sujith, G. UnnikrishnanAbstract:Composites based on natural rubber (NR), ethylene vinyl acetate (EVA) and carbon black were prepared. Three types of carbon black viz.; semireinforcing furnace (SRF), high-abrasion furnace (HAF) and intermediate superabrasion furnace (ISAF) were used for reinforcement. The barrier properties of these filled samples were examined in an atmosphere of petrol, kerosene and diesel. Blends loaded with ISAF exhibited the lowest liquid uptake which has been attributed to the Higher Filler reinforcement and crosslink density of the matrix. Among the three vulcanising systems used, viz.; sulphur (S), dicumyl peroxide (DCP) and mixed (S+DCP), DCP crosslinked samples exhibited high barrier properties to the probe molecules. Diesel showed the lowest interaction with the composites compared to petrol and kerosene. The sorption data were used to estimate the enthalpy, entropy and free energy of the transport process.
Alexander M. Aladyshev - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and Properties of Polypropylene/Multiwall Carbon Nanotube Composites
Macromolecules, 2008Co-Authors: Anton A. Koval’chuk, Alexander N. Shchegolikhin, Vitaliy G. Shevchenko, P. M. Nedorezova, Alla N. Klyamkina, Alexander M. AladyshevAbstract:Isotactic polypropylene and elastomeric stereoblock polypropylene nanocomposites containing 0.1−3.5 wt % multiwall carbon nanotubes (MWCNTs) have been synthesized via the in situ polymerization approach using MAO-activated C2- and C1-symmetry ansa-zirconocenes, a technique that has not been previously reported in literature. Fracture morphology examination of the nanocomposites revealed very efficient distribution of the MWCNTs within the isotactic polypropylene matrix, yet interfacial adhesion level and the reinforcement efficiency were dependent on the nanotube loadings. The elastomeric stereoblock polypropylene/MWCNT and the isotactic polypropylene-based nanocomposites exhibited different morphologies depending on the synthesis peculiarities. For isotactic polypropylene, Youngʼs modulus increased by ∼22% even at 0.1 wt % MWCNT loading, and further modulus growth was observed at Higher Filler contents. Relatively low permittivity values and considerable dielectric losses in microwave range infer that th...