本研究主要針對純化凹凸棒土(purified attapulgite (ATP))及酸處理凹凸棒土(acid treated attapulgite (ATP))含量對超高分子量聚乙烯(ultrahigh molecular weight polyethylene, UHMWPE)/ purified ATP (F2Ay)及UHMWPE/acid treated ATP (F2AxM-y) 初絲樣品的可延伸性質作一有系統性探討。F2Ay及F2AxM-y初絲樣品的可延伸比(Dra)數值分別隨純化和酸處理凹凸棒土添加量增加達到0.05 及0.025 phr最適化值時達到最大值。在相同凹凸棒土添加量下，每個F2AxM-y初絲樣品的Dra數值都明顯高於F2Ay初絲樣品的Dra數值。值得注意的是， F2AxM-0.0005初絲系列樣品的Dra數值隨鹽酸達5M之最適化酸蝕濃度時，其Dra數值達到另一最大數值249 。經延伸相同倍率的F2Ay和F2AxM-y纖維系列樣品，其順向度(fo)數值隨其內純化或酸處理凹凸棒土含量分別達最適化0.05及0.025 phr添加量時，其對應的fo數值均達到最大值。在相同的延伸倍率及凹凸棒土添加量下，F2AxM-y延伸纖維樣品的fo值比F2Ay延伸纖維樣品的fo值高。 值得注意的是當鹽酸濃度及處理時間分別在最適化之5M和60分鐘時，F2A5M-0.0005延伸纖維樣品的fo值均較經其他酸蝕條件製備之對應具相同延伸倍率F2AxM-0.0005延伸纖維樣品為高。抗張性能研究表明，當加入最適量的純化或酸處理凹凸棒土，延伸後的纖維樣品F2Ay和F2AxM-y 都能獲得優異的抗張性能。為了瞭解上述這些有趣的現象，本研究中對純化或酸處理凹凸棒土的表面元素及型態, 比表面積與紅外光譜進行分析, 另亦對初絲或延伸纖維樣品的DSC熱學, 順向度和抗張性質進行研究。

Systemic investigation of the influence of the original and modified nanosilica contents on the ultradrawing properties of ultrahigh molecular weight polyethylene(UHMWPE)/purified ATP (F2Ay) and UHMWPE/ acid treated ATP (F2AxM-y) as-prepared fibers are reported. After treating ATP nanofibers in a 5 M HCl solution for 60 minutes, the maximal specific surface areas of the acid treated ATP nanofibers reaches around 282 m2/g. After incorporation of purified or acid treated ATP in UHMWPE, the Tm (or lc) and Xc values of F2Ay and F2AxM-y as-prepared fiber series specimens reduce and increase significantly, respectively, as their purified and/or acid treated ATP contents increase. In which, Tm(or lc) and Xc values of the F2AxM-y as-prepared fiber specimens are significantly lower and higher than those of the corresponding F2Ay as-prepared fiber specimens with the same ATP contents but without treating with HCl solutions, respectively. Moreover, it is worth noting that F2AxM-y as-prepared fiber series specimens exhibits the lowest Tm(or lc) but the highest Xc values with the fixed acid treated ATP contents and the hydrochloric acid concentration increaseing to 5M optimal value. The Dra values of F2Ay as-prepared fiber series specimens increase significantly with the initial increase in purified ATP contents and then reach a maximal value at 145 as their purified ATP contents approach an optimum value at 0.05 phr . After treatment of hydrochloric acid on purified ATP nanofibers, the Dra values of each F2AxM-y as-prepared fiber series specimens are significantly higher than those of the corresponding F2Ay as-prepared fiber specimens with the same purified ATP contents but without acid treatment. Similar to those found for F2Ay as-prepared fiber specimens, the Dra values of each F2AxM-y as-prepared fiber series specimens reach a maximal value as their acid treated ATP contents approach a lower optimum value at 0.025 phr. Moreover, it is worth noting that the maximum Dra values of the F2AxM-0.0005 as-prepared fiber specimens reached another maximum value at 249 as their purified ATP nanofibers were treated by 5M HCl. The fo values of drawn F2Ay and F2AxM-y fiber specimens with the same draw ratios reach a maximum value as their purified and acid treated ATP contents approach the optimum values at 0.05 and 0.025 phr, respectively. In which, fo values of drawn F2AxM-y fiber specimens are higher than those of the corresponding F2Ay fiber specimens with the same draw ratios and ATP contents but without treating with HCl solutions. It is worth to note that the fo values of drawn F2A5M-0.0005 fiber specimens are higher than those of the corresponding F2AxM-0.0005 fiber specimens as the HCl treating time approach the optimum value at 60 minutes. Tensile property analysis further suggested that excellent orientation and tensile properties of the drawn F2Ay and F2AxM-y fibers can be obtained by ultradrawing the fibers prepared at their optimum purified ATP and/or acid treated ATP contents. To understand the interesting orientation, ultradrawing and tensile properties of F2Ay and F2AxM-y fiber specimens, elemental and morphological analysis, specific surface areas, FTIR, thermal properties of the as-prepared fibers, orientation factor, achievable draw ratios and tensile properties of the purified and acid treated ATP were performed in this study.

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