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    • Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass fibre reinforced LLDPE

      Takeshi Kitano S A R Hashmi Navin Chand

      Composites Volume 27 Issue 5 October 2004 pp 409-415

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/027/05/0409-0415

    • Keywords

       

      Kevlar fibre; glass fibre; LLDPE; rheological properties; hybrid composites.

    • Abstract

       

      An experimental study was conducted to observe the effects of parallel-superposed flow condition on viscoelastic properties of LLDPE, Kevlar fibre reinforced LLDPE and hybrid of short glass fibre and Kevlar fibre reinforced LLDPE. Parallel-plate rheometer was employed for these tests. Rheological parameters such as loss modulus (𝐺″) and dynamic viscosity (𝜂′) do not vary significantly on superposing steady state shear with oscillatory shear in the studied range of experiment at 185°C in un-reinforced LLDPE. Kevlar fibre reinforced LLDPE and Kevlar/glass fibre reinforced LLDPE showed significant changes in the flow behaviour under various sets of superposed conditions. Storage modulus (𝐺′), and 𝐺″ become highly sensitive to low oscillatory angular frequencies (𝜔) under superposed conditions. These curves show two different regions with increased 𝜔 value. At low 𝜔 values, parameters 𝐺′ and 𝐺″ change sharply reaching a certain value, thereafter, changes are moderate with increased 𝜔. In case of 𝜂′ a maxima is observed, position of which, depends upon the value of steady shear rate. Maxima shifts towards higher frequencies with the increased steady shear rate.

    • Author Affiliations

       

      Takeshi Kitano1 S A R Hashmi2 Navin Chand2

      1. Research Centre of Macromolecular Technology, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305–0046, Japan
      2. Regional Research Laboratory, Hoshangabad Road, Bhopal 462 026, India

    • Dates

       
      Published
      October 2004
      Manuscript received
      7 April 2004
      Manuscript revised
      9 August 2004

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