Study on the influence of electron beam irradiation on the thermal, mechanical, and rheological properties of ethylene-octene copolymer with high comonomer content

Authors

  • Sameepa Poongavalappil,

    1. Department of Polymer Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nam. T.G. Masaryka 275, 762 72 Zlin, Czech Republic
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  • Petr Svoboda,

    Corresponding author
    1. Department of Polymer Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nam. T.G. Masaryka 275, 762 72 Zlin, Czech Republic
    2. Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, 760 01, Zlin, Czech Republic
    • Centre of Polymer Systems, Faculty of Technology, Tomas Bata University in Zlin, Nam. T.G. Masaryka 5555, 760 01 Zlin, Czech Republic
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  • Rajesh Theravalappil,

    1. Department of Polymer Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nam. T.G. Masaryka 275, 762 72 Zlin, Czech Republic
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  • Dagmar Svobodova,

    1. Faculty of Humanities, Tomas Bata University in Zlin, Mostni 5139, 760 01 Zlin, Czech Republic
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  • Michal Danek,

    1. BGS Beta-Gamma-Service GmbH & Co. KG, Fritz-Kotz-Strasse 16, 51674 Wiehl, Germany
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  • Martin Zatloukal

    1. Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, 760 01, Zlin, Czech Republic
    2. Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Nam. T. G. Masaryka 275, 762 72 Zlín, Czech Republic
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Abstract

Ethylene-octene copolymer (EOC) was irradiated using electron beam irradiation at different dosages (30, 60, 90, and 120 kGy). Effect of irradiation dosage on thermal and mechanical properties was studied. When compared to low density polyethylene, EOC exhibited higher degree of crosslinking reflected in increased gel content, higher elastic modulus (G′), and lower tan δ obtained by rheology measurement at 150°C. Crosslinking caused improvement in high-temperature creep and room temperature and also elevated temperature elastic properties. Differential scanning calorimetry revealed that e-beam irradiation has caused a gradual reduction in crystallinity and a presence of a fraction with higher melting temperature. In the case of EOC, as the extent of crosslinking increased, stress at break showed an increasing trend whereas irradiation dosage had an inverse effect on elongation at break. Radiation dosage has positive effect on thermal stability estimated by thermogravimetric analysis. After 30 min of thermal degradation at 220°C, slightly higher C[DOUBLE BOND]O peak for crosslinked sample was found by Fourier transform infrared spectroscopy while for room temperature samples no C[DOUBLE BOND]O peak was detected. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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