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    Title: Evaluate the nonlinear viscoelasticity of polyolefin melts using the Larson model
    Authors: Lin, Gwo-Geng;Song, Yi-Hu;Shiu, Tai-Yi;Cheng, Hsin-Der
    Contributors: 淡江大學化學工程與材料工程學系
    淡江大學能源與光電材料研究中心
    Keywords: Nonlinear Viscoelasticity;Polyolefins;Damping Function;Larson Model;Elongation Viscosity;First Normal Stress Difference
    Date: 2013-10
    Issue Date: 2013-11-24 11:18:44 (UTC+8)
    Publisher: Hoboken: John Wiley & Sons, Inc.
    Abstract: Nonlinear rheological properties of polyolefins have long been studied and predicted by using the Larson model with the damping function generally obtained from the stress relaxation measurements. In this study, we investigate the nonlinear rheological properties of high density polyethylene (HDPE) and polypropylene (PP) using the Larson model with damping functions obtained from either the dynamic frequency sweep or the stress relaxation test. Experimental measurements and their corresponding model predictions for the rheological parameters were then compared to evaluate the applicability of the Larson model to the nonlinear rheology, and the following conclusions could be achieved. The steady shear viscosity could be satisfactorily described by the Larson model with the damping functions obtained from the two different methods, except at shear rates higher than 103 s-1. The predicted first normal stresses also account for the measured data, except for those using the stress relaxation data showing a little deviation for the PP sample. In addition, the predictions for elongation viscosity are also in good agreement with the experimental results within the short range of elongation rate achieved in this work.
    Relation: Polymer Engineering & Science 54(10), pp.2354–2361
    DOI: 10.1002/pen.23788
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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