A comparative study on curing characteristics and thermomechanical properties of elastomeric nanocomposites: The effects of eggshell and calcium carbonate nanofillers

Authors

  • Mohammad Reza Saeb,

    1. Department of Resin and Additives, Institute for Color Science and Technology, Tehran 16765-654, Iran
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  • Hadi Ramezani-Dakhel,

    Corresponding author
    1. Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, University of Akron, Akron, Ohio 44325-0301
    • Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, University of Akron, Akron, Ohio 44325-0301
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  • Hossein Ali Khonakdar,

    1. Department of Polymer Processing, Iran Polymer and Petrochemical Institute, Tehran 14965-115, Iran
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  • Gert Heinrich,

    1. Department of Materials and Processing, Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Strasse 6, Dresden D-01069, Germany
    2. Department of Mechanical Engineering, Technische Universität Dresden, Institut für Werkstoffwissenschaft, Dresden D-01069, Germany
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  • Udo Wagenknecht

    1. Department of Materials and Processing, Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Strasse 6, Dresden D-01069, Germany
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Abstract

After-hatching eggshell (AHES) nanobiofiller and nanocalcium carbonate (nano-CA) were separately added to various elastomers, such as acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), and natural rubber (NR), in various amounts of 5, 10, and 15 phr. The effect of particle size and dispersion of such nanofillers on thermomechanical properties and curing characteristics were then investigated. The ultimate tensile properties of SBR and NR nanocomposites were improved to some extent when 5 phr of AHES nanofiller was added to the rubber compound compared to CA. In the case of NBR nanocompounds, however, the mechanical properties were seemingly comparable, irrespective of the type of nanofiller. This contradictive behavior could be attributed to the alteration of crosslink density due to particular filler–matrix interaction while using mineral and natural fillers. The results of the rheometric study revealed that using AHES rather than CA slightly increases the scorch time of all types of prepared nanocomposites, whereas a significant drop in the optimum curing time was seen for NBR nanocomposites containing AHES biofiller. Moreover, thermogravimetric analysis showed similar thermal stability for SBR nanocomposites containing AHES and CA fillers. Finer particle size of CA and higher porosity of AHES at high and low loading levels were respectively the main reasons for improvement of ultimate properties. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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