Dr., Takeshi Kitano and Dr., S A R Hashmi and Navin, Chand (2005) Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass fibre reinforced LLDPE. Bulletin of Materials Science, 27. pp. 409-415. ISSN 0250-4707

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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 (G²) and dynamic viscosity (h¢) 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 G² become highly sensitive to low oscillatory angular frequencies (w) under superposed conditions. These curves show two different regions with increased w value. At low w values, parameters G¢ and G² change sharply reaching a certain value, thereafter, changes are moderate with increased w. In case of h¢ 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.

Item Type:	Article
Subjects:	Lightweight Materials > Polymeric Materials
Divisions:	UNSPECIFIED
Depositing User:	Mr. B.K. Prasad
Date Deposited:	22 Jul 2013 07:39
Last Modified:	05 Mar 2014 09:01
URI:	http://ampri.csircentral.net/id/eprint/21

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