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

Bulletin of materials science

S A R Hashmi¹  Takeshi Kitano²  Navin Chand¹ 

[1] Regional Research Laboratory, Hoshangabad Road, Bhopal 462 026, India$$Regional Research Laboratory, Hoshangabad Road, Bhopal 462 026, IndiaRegional Research Laboratory, Hoshangabad Road, Bhopal 462 026, India$$;Research Centre of Macromolecular Technology, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305â€�??0046, Japan$$Research Centre of Macromolecular Technology, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305â€�??0046, JapanResearch Centre of Macromolecular Technology, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305â€�??0046, Japan$$

关键词: Kevlar fibre;    glass fibre;    LLDPE;    rheological properties;    hybrid composites.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

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 (�?) under superposed conditions. These curves show two different regions with increased �? value. At low �? values, parameters 𝐺�? and 𝐺�? change sharply reaching a certain value, thereafter, changes are moderate with increased �?. 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.

【 授权许可】

Unknown