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′), andG″ 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, parametersG′ andG″ 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.
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References
Amari T, Wei X and Watanabe K 1992Theoretical and applied rheology, Proc. XIth Int. Congress on Rheology (eds) P. Moldenaers and R Keunings (Brussels: Elsevier Science Pub- lisher) p. 573
Booij H C and Palmen J H M 1982Rheol. Acta 21 376
Hashmi S A R, Kitano T and Chand N 2002Polym. Compos. 23 500
Hashmi S A R, Kitano T and Chand N 2003Polym. Compos. 24 149
Isayev A I and Wong C M 1988J. Polym. Sci. Polym. Phys. Ed. 26 2303
Kataoka T, Ohnishi S, Kitano T, Nakama K and Takayama H 1976Rheol. Acta 15 268
Kitano T, Hashmi S A R and Chand N 2001Appl. Rheol. 11 258
Masi P, Nicodemo L, Nicolais L and Taglialatela G 1982Rheol. Acta 21 598
McKenna G B and Zapas L J 1986Polym. Eng. Sci. 26 725
Osaki K, Tamura M, Kurata M and Kotaka T 1965J. Phys. Chem. 69 4185
Pipkin A C 1968Trans. Soc. Rheol. 12 397
Pipkin A C and Owen D R 1967Phys. Fluids 10 836
Powel R L and Schwarz W H 1979J. Polym. Sci. Polym. Phys. Ed. 17 969
Wong C M and Isayev A I 1989Rheol. Acta 28 176
Wong C M, Chen C H and Isayev A I 1990Polym. Eng. Sci. 30 1574
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Kitano, T., Hashmi, S.A.R. & Chand, N. Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass fibre reinforced LLDPE. Bull Mater Sci 27, 409–415 (2004). https://doi.org/10.1007/BF02708556
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DOI: https://doi.org/10.1007/BF02708556