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    Die geometry induced heterogeneous morphology of polypropylene inside the die during die-drawing process

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    lyu_et_al_2019.pdf (587.6Kb)
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    Publication date
    2019-04
    Author
    Lyu, D.
    Sun, Y.
    Thompson, Glen P.
    Lu, Y.
    Caton-Rose, Philip D.
    Lai, Y.
    Coates, Philip D.
    Men, Y.
    Keyword
    Die drawing
    Isotactic-polypropylene
    X-ray
    Die geometry
    Orientation
    Rights
    © 2019 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The morphology distribution of isotactic-polypropylene (iPP) shaped through a die during hot stretching process was investigated via wide-angle X-ray diffraction technique. The evolution of micro-structures in the outer layer (layer closer to the die wall) and the inner layer (layer in the center of die) of die-drawn iPP were both recorded. It turned out that the difference of morphology distribution between outer and inner layers changes with the distance from the die entrance to exit. In general, a larger difference between outer and inner layers could be found at the intermediate deformation region inside the die while such difference disappeared at both of the entrance and exit regions of die. These behaviors could be interpreted as a result of the existence of a heterogeneous distribution of force field inside the die, which was caused by the die geometry and inclination of the drawing force. This work showed that the heterogeneous force field inside the die could be revealed through analyzing the morphology of a die-drawn sample.
    URI
    http://hdl.handle.net/10454/17001
    Version
    Accepted manuscript
    Citation
    Lyu D, Sun Y, Thompson GP et al (2019) Die geometry induced heterogeneous morphology of polypropylene inside the die during die-drawing process. Polymer Testing. 74: 104-112.
    Link to publisher’s version
    https://doi.org/10.1016/j.polymertesting.2018.12.019
    Type
    Article
    Collections
    Engineering and Informatics Publications

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