Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass fibre reinforced LLDPE
IR@AMPRI: CSIR-Advanced Materials and Processes Research Institute, Bhopal
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| Title |
Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass fibre reinforced LLDPE
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| Creator |
Dr., Takeshi Kitano
Dr., S A R Hashmi Navin, Chand |
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| Subject |
Polymeric Materials
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| Description |
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.
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| Date |
2005
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| Type |
Article
PeerReviewed |
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| Identifier |
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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| Relation |
http://ampri.csircentral.net/21/
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