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    題名: Spinning and drawing properties of ultrahigh-molecular-weight polyethylene fibers prepared at varying concentrations and temperatures
    作者: Jian, Tao;Shyu, Wei-de;Lin, Yue-tang;Chen, Kan-nan;Yeh, Jen-taut
    貢獻者: 淡江大學化學學系
    日期: 2003-11
    上傳時間: 2009-11-04 16:56:56 (UTC+8)
    出版者: Society of Plastics Engineers; John Wiley & Sons
    摘要: The concentrations and temperatures of ultrahigh-molecular-weight polyethylene (UHMWPE) gel solutions exhibited a significant influence on their rheological and spinning properties. The shear viscosities of UHMWPE solutions increased consistently with increasing concentrations at a constant temperature above 80°C. Tremendously high shear viscosities of UHMWPE gel solutions were found as the temperatures reached 120–140°C, at which their shear viscosity values approached the maximum. The spinnable solutions are those gel solutions with optimum shear viscosities and relatively good homogeneity in nature. Moreover, the gel solution concentrations and spinning temperatures exhibited a significant influence on the drawability and microstructure of the as-spun fibers. At each spinning temperature, the achievable draw ratios obtained for as-spun fibers prepared near the optimum concentration are significantly higher than those of as-spun fibers prepared at other concentrations. The critical draw ratio of the as-spun fiber prepared at the optimum concentration approached a maximum value, as the spinning temperature reached the optimum value of 150°C. Further investigations indicated that the best orientation of the precursors of shish-kebab-like entities, birefringence, crystallinity, thermal and tensile properties were always accompanied with the as-spun fiber prepared at the optimum concentration and temperature. Similar to those found for the as-spun fibers, the birefringence and tensile properties of the draw fibers prepared at the optimum condition were always higher than those of drawn fibers prepared at other conditions but stretched to the same draw ratio. Possible mechanisms accounting for these interesting phenomena are proposed.
    關聯: Polymer Engineering & Science 43(11), pp.1765-1777
    DOI: 10.1002/pen.10149
    顯示於類別:[化學學系暨研究所] 期刊論文

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