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The effects of UV irradiation exposure on the structure and properties of polypropylene/ZnO nanocamposite fibers

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Abstract

Unfilled polypropylene and polyropylene/ZnO nanocomposite fibers were produced using a melt spinning apparatus; then the fibers were exposed to UV irradiation. The structure and properties of the fibers were examined using scanning electron microscopy, tensile measurements, wide angle X-ray diffraction (WAXD), Fourier transform infrared (FTIR) spectroscopy, birefringence measurements and differential scanning calorimetry (DSC). Following 150 hours of exposure to UV irradiation, some transverse cracks on the surface of unfilled polypropylene fibers were observed. It was observed that both carbonyl and hydroperoxide indexes, which are the criteria for the detection of UV degradation of the fibers, were increased due to the increase in the UV irradiation exposure time and the increase in these indexes was smaller for nanocomposite fibers than those of unfilled Polypropylene fibers. It was also observed that crystallinity, crystallite size and total molecular orientation of UV irradiated nanocomposite fibers were increased in comparison with non-irradiated nanocomposite fibers. It was also found that the extent of increase in molecular orientation of the fibers was higher comparing to that for the nanocomposite fibers due to the UV irradiation exposure for the unfilled polypropylene fibers. Tensile properties of both unfilled and nanocomposite fibers were decreased after UV irradiation; this reduction correlated with the extent of the increase in molecular degradation of the fibers, as determined by measuring carbonyl and hydroperoxide indexes.

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Authors and Affiliations

  1. Department of Textile Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Z. Karami, M. Youssefi & S. Borhani

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  1. Z. Karami
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  2. M. Youssefi
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  3. S. Borhani
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Correspondence to M. Youssefi.

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Karami, Z., Youssefi, M. & Borhani, S. The effects of UV irradiation exposure on the structure and properties of polypropylene/ZnO nanocamposite fibers. Fibers Polym 14, 1627–1634 (2013). https://doi.org/10.1007/s12221-013-1627-9

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  • DOI: https://doi.org/10.1007/s12221-013-1627-9

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