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Polymorphism in polypropylene fibers

Authors

  • Jan Broda

    Corresponding author
    1. Institute of Textile Engineering and Polymer Materials, University of Bielsko-Biała, 43-309 Bielsko-Biała, ul. Willowa 2, Poland
    • Institute of Textile Engineering and Polymer Materials, University of Bielsko-Biała, 43-309 Bielsko-Biała, ul. Willowa 2, Poland
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Abstract

The structure of polypropylene fibers formed by different spinning conditions was studied. The investigations were carried out using wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) methods. It was stated that in noncolored fibers the mesophase and the monoclinic α forms were formed. The highest content of the mesophase was observed for fibers extruded at the higher temperature and taken at the medium take-up velocity. In fibers colored with quinacridone pigment the structure containing the monoclinic α and the trigonal β forms was obtained. The highest content of the β form occurred in fibers taken at the lowest take-up velocity. The increase of the take-up velocity caused a rapid drop in β form content. In fibers taken at higher velocities only the α form was formed. It was found that the content of different forms as well lamellar thickness depends on crystallization conditions, which were influenced by the formation parameters. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3364–3370, 2003

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