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Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Authors

  • Luca Fambri,

    Corresponding author
    1. Department of Industrial Engineering, University of Trento, Trento, Italy
    2. National Interuniversity Consortium of Materials Science and Technology (INSTM), Firenze, Italy
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  • Izabela Dabrowska,

    1. Department of Industrial Engineering, University of Trento, Trento, Italy
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  • Alessandro Pegoretti,

    1. Department of Industrial Engineering, University of Trento, Trento, Italy
    2. National Interuniversity Consortium of Materials Science and Technology (INSTM), Firenze, Italy
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  • Riccardo Ceccato

    1. Department of Industrial Engineering, University of Trento, Trento, Italy
    2. National Interuniversity Consortium of Materials Science and Technology (INSTM), Firenze, Italy
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ABSTRACT

Fibers of high density polyethylene (HDPE)/organically modified hydrotalcite (LDH) were produced by melt intercalation in a two-step process consisting of twin-screw extrusion and hot drawing. The optimum drawing temperature was 125°C at which the draw ratios up to 20 could be achieved. XRD analysis revealed intercalation with a high degree of exfoliation for the composites with 1–2% of LDH. Higher thermal stability of nanofilled fibers was confirmed by TGA analysis. DSC data indicated that dispersed LDH particles act as a nucleating agent. Crystallization kinetics of the HDPE matrix in the composite fibers is characterized by two transition temperatures, that is, for Regimes I/II at 123°C and for Regimes II/III ranging between 114–119°C as a function of the nanocomposite composition. Fibers with 1–2% of LDH show for the drawing ratios up to 15 a higher elastic modulus, 9.0–9.3 GPa (with respect to 8.0 GPa of the neat HDPE), maintain tensile strength of 0.8 GPa and deformation at break of 20–25%. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40277.

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