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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/98980

    Title: Experimentation and modeling for the apparent elongation viscosity of polymer melts with the White-Metzner model
    Authors: Gwo-Geng Lin;Jin-Ton Chang;Ting-Wei Kuo
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: elongational viscosity;fiber spinning;White-Metzner model;polyolefin;Trouton ratio
    Date: 2014-09-30
    Issue Date: 2014-10-03 10:39:38 (UTC+8)
    Publisher: John Wiley & Sons Ltd.
    Abstract: The measurement of the apparent elongation viscosity ( ) of several polyolefin melts was conducted in this study by using the isothermal fiber-spinning method. The White-Metzner (W-M) model was used to analyze the spinning flow of the polymer melts and, thus, the elongation viscosity was predicted at elongation strain rates ranging from 0 to approximately 5 s-1. The values of the model parameters required in the W-M model were obtained by curve-fitting the experimental data obtained from the shear measurements. The elongation viscosity predicted using the W-M model was in good agreement with the experimental results of fiber spinning. In addition, could also be estimated directly from the measured shear viscosity ( ) with a formulation using the W-M model; the subsequently obtained elongation viscosity and Trouton ratio ( ) were reasonable within a wide range of strain rates. Based on the experimental and theoretical results, the polyolefin with a high molecular weight was observed to have high elongation viscosity, and the polymer with a broad molecular weight distribution also possessed high . The TR value of the commercial polypropylene (PP-1040) began to increase from 3 at a deformation rate of 0.1 s-1 and grew up asymptotically to 10, whereas the TR of high-density polyethylene (HDPE-606) remained at 3 within the entire range of strain rates.
    Relation: Polymers for Advanced Technologies 25(12), pp.1565–1571
    DOI: 10.1002/pat.3404
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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