Photocross-linking of low-density polyethylene. III. Supermolecular structure studied by SALS

Authors

  • Bao Jun Qu,

    1. Structure Research Laboratory, University of Science and Technology of China, 230026 Hefei, Anhui, China
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  • Bengt Rånby

    Corresponding author
    1. Department of Polymer Technology, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
    • Department of Polymer Technology, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

The supermolecular structure of photocross-linked polyethylene (XLPE) has been studied by small-angle light scattering (SALS). The data show that the spherulitic structure of XLPE gradually deteriorates with increasing degree of cross-linking and increasing irradiation temperature from well-developed spherulites to rodlike aggregates and disordered lamellar structures. A photocross-linked sample of PE has lower crystallinity, smaller crystallites, and smaller spherulites than does the original sample. At high degrees of cross-linking, the SALS patterns show little or no spherulitic structure. Results with photocross-linked polyethylene demonstrate that the overall effect of cross-linking on the morphological structure is similar to that of an increase in molecular weight of the polymer. © 1993 John Wiley & Sons, Inc.

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