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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/77236

    Title: Ultradrawing properties of ultrahigh- molecular-weight polyethylene/carbon nanotube fibers prepared at various formation temperatures
    Authors: Yeh, Jen-taut;Lai, Yu-ching;Hai, Liu;Shu, Yao-chi;Huang Chi-yuan;Huang Kuo-shien;Chen Kan-nan
    Contributors: 淡江大學化學學系
    Keywords: ultrahigh-molecular-weight polyethylene;carbon nanotubes;formation temperatures
    Date: 2011-01
    Issue Date: 2012-06-14 09:09:01 (UTC+8)
    Publisher: Chichester: John Wiley & Sons Ltd.
    Abstract: The influence of formation temperature on the ultradrawing properties of ultrahigh-molecular-weight polyethylene/carbon nanotube (UHMWPE/CNT) fiber specimens is investigated. Gel solutions of UHMWPE/CNT with various CNT contents were gel-spun at the optimum concentration and temperature but were cooled at varying formation temperatures in order to improve the ultradrawing and tensile properties of the UHMWPE/CNT composite fibers. The achievable draw ratio (Dra) values of UHMWPE/CNT as-prepared fibers reach a maximum when they are prepared with the optimum CNT content and formation temperature. The Dra value of UHMWPE/CNT as-prepared fibers produced using the optimum CNT content and formation temperature is about 33% higher than that of UHMWPE as-prepared fibers produced using the optimum concentration and formation temperature. The percentage crystallinity (Wc) and melting temperature (Tm) of UHMWPE/CNT as-prepared fiber specimens increase significantly as the formation temperature increases. In contrast, Wc increases but Tm decreases significantly as the CNT content increases. Dynamic mechanical analysis of UHMWPE and UHMWPE/CNT fiber specimens exhibits particularly high α-transition and low β-transition, wherein the peak temperatures of α-transition and β-transition increase dramatically as the formation temperature increases and/or CNT content decreases. In order to understand these interesting drawing, thermal and dynamic mechanical properties of the UHMWPE and UHMWPE/CNT as-prepared fiber specimens, birefringence, morphological and tensile studies of as-prepared and drawn fibers were carried out. Possible mechanisms accounting for these interesting properties are proposed.
    Relation: Polymer international 60(1), pp.59-68
    DOI: 10.1002/pi.2911
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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