| Summary: | 碩士 === 國立臺灣科技大學 === 高分子系 === 97 === The CNTs contents, UHMWPE concentrations and formation temperatures of ultrahigh-molecular-weight polyethylene (UHMWPE) and carbon nanotubes (mCNTs) added gel solutions exhibited significant influence on their rheological properties and the drawability of the corresponding UHMWPE/mCNTs as-prepared fibers. Tremendously high shear viscosities (�喒) of UHMWPE gel solutions were found as the temperatures reached 140℃, at which their �喒 values approached the maximum. After adding mCNTs, the �喒 values of UHMWPE/mCNTs gel solutions increase significantly and reach a maximum value as the mCNTs contents increase up to a specific value. After addition of mCNTs, the achievable draw ratios of UHMWPE/mCNTs as-prepared fibers prepared near the optimum concentration improve consistently and reach a maximum value as their mCNTs contents increase up to an optimum value. Moreover, the achievable draw ratios of the UHMWPE and UHMWPE/mCNTs as-prepared fibers reach maximum when they are prepared at an optimum formation temperature of 5°C. In fact, the achievable draw ratio of UHMWPE/mCNTs as-prepared fibers prepared from the gel solution with the optimum mCNTs, UHMWPE composition and formation temperature are about 110.2% higher than those of the UHMWPE as-prepared fibers prepared at the optimum concentration. Moreover, In order to understand these interesting drawing properties of the UHMWPE, UHMWPE/CNTs and UHMWPE/mCNTs as-prepared fibers, thermal, morphological and tensile properties of the as-prepared and drawn fibers were investigated.
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