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    題名: Influence of Drawing Conditions on the Ultradrawing Properties of Film Specimens of Ultrahigh Molecular Weight Polyethylene and Low Molecular Weight Polyethylene Blends
    作者: Yeh, Jen-taut;Lin, Yue-tang;Chen, Kan-nan
    貢獻者: 淡江大學化學學系
    關鍵詞: achievable draw ratio;activation energy;apparent elongational viscosity;gel;optimum drawing temperature;ultradrawing
    日期: 2003-03
    上傳時間: 2009-11-04 16:53:30 (UTC+8)
    出版者: Dordrecht: Springer Netherlands
    摘要: The influence of the drawing temperature and rate on the ultradrawing properties and deformation mechanisms of a series of film specimens prepared from varying concentrations of gel solutions of ultrahigh molecular weight polyethylene (UHMWPE) and low molecular weight polyethylene (LMWPE) blends is reported. The maximum achievable draw ratio was obtained when each UHMWPE/LMWPE film specimen was drawn at an optimum temperature (T op), wherein the T op values of each UHMWPE/LMWPE film specimen increased consistently with the drawing rate. The temperature dependence of the apparent elongational viscosity (a) revealed two distinguishable intervals with different activation energies. Coincidentally, the transition temperature (T r) obtained from the intersection of the two straight lines drawn parallel to the two distinct intervals is approximately equal to the T op value found for the film sample drawn at the same rate. Dynamic mechanical analysis of the film samples exhibited an extraordinary high transition peaked at temperatures near 95–115C, which are again very close to the T op and T r values found for the film samples drawn at varying rates, and increases significantly with the testing frequencies. Possible mechanisms accounting for these interesting deformations, temperature dependence of the apparent elongational viscosity and dynamic mechanical properties are suggested in this study.
    關聯: Journal of Polymer Research 10(1), pp.55-63
    DOI: 10.1023/A:1023961216058
    顯示於類別:[化學學系暨研究所] 期刊論文

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