A rheological method exploiting Cole-Cole plot allows gel quantification in Natural Rubber |
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| Affiliation: | 1. CIRAD, UMR IATE, F-34060 Montpellier, France;2. ANVIS SD France SAS, F-58300 Decize, France;1. Chair of Applied Mechanics, Friedrich-Alexander-University Erlangen-Nuremberg, Egerlandstraße 5, 91058 Erlangen, Germany;2. Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany;1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran;2. Center of Excellence for High Strength Alloys Technology (CEHSAT), Tehran, Iran;3. Rubber Group, Iran Polymer & Petrochemical Institute, Nano and Smart Polymers Center of Excellence, Tehran-Karaj Hwy, Iran;1. KU Leuven, Department of Mechanical Engineering, Belgium;2. Materialise NV, Corporate R&D, HQ Leuven, Belgium |
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| Abstract: | Raw Natural Rubber (NR) quality, rather variable, is controlled according to international standards (ISO2000, etc.). Despite these standards, better characterization of this complex material is still needed to reduce feedstock waste and energy losses in the manufacturing processes. Twenty-four NR samples were studied. Their gel contents were quantified after dissolution in tetrahydrofuran. The rheological properties of the raw NR samples were measured in double-shear geometry. The Cole-Cole plot of the shear moduli (G″ = f(G′)) was used to graphically calculate an h parameter, described as an indicator of the crosslink density of a polymer. The total gel of NR was found to clearly influence the rheological properties of the material at low frequency. This study also showed that the microgel of NR accounted for 46–92% of the total gel, and cannot be neglected when investigating the influence of gel on NR properties. |
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| Keywords: | Natural rubber Gel Rheology Cole-Cole plot |
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