臺灣博碩士論文加值系統

本研究發現超高分子量聚乙烯（UHMWPE）凝膠溶液的濃度與溫度對其流變與紡絲性能具有深遠的影響。 在相同溫度下，UHMWPE凝膠溶液之剪切黏度隨其濃度增加而明顯增加。 在溫度到達120-140℃間時，UHMWPE凝膠溶液之剪切黏度大幅增加並達到一最大值。 值得注意的是，具可紡性的凝膠溶液其本質上通常具有適當的剪切黏度與均勻之紡液型態。 此外，凝膠溶液的濃度及紡絲溫度亦明顯對紡絲後之初絲的微細構造與延伸性有深遠的影響。 在固定每個紡絲溫度條件下，接近其最適化濃度製備之初絲所具有的可延伸比均較經其他濃度製備之樣品為高，當紡溫到達最適化溫度150℃時，在最適化濃度製備之初絲的臨界延伸比可以達到最大值。 進一步發現，在最適化濃度與溫度製備的初絲均有較順向的Shish-Kebab結構、結晶度、熱學與強力性質。 相似於上述的現象，在最適化條件所製備的初絲經相同延伸比後，其雙折射及強力性質亦較其他條件為高。

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℃. Tremendous high shear viscosities of UHMWPE gel solutions were found as the temperatures reached 120-140℃, 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℃. Further investigations indicated that the best orientation of Shish-Kebab morphology, 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 drawn 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.

論文摘要......................................................I
ABSTRACT......................................................II
誌 謝.....................................................III
目 錄......................................................IV
圖表索引......................................................VI
一、前言......................................................1
二、文獻回顧..................................................3
2.1 高分子凝膠...............................................3
2.1.1 高分子凝膠的特性........................................3
2.1.2 分子量對凝膠樣品的影響..................................9
2.1.3 高分子凝膠樣品結晶及熱學性質............................10
2.2 高分子摻混分類及樣品的延伸性質...........................14
2.3 超高強力聚乙烯纖維的發展與製備技術.......................21
三、實驗......................................................23
3.1 原料及樣品製備...........................................23
3.2 凝膠溶液黏度測定..........................................25
3.3 凝膠纖維延伸性能之測定....................................27
3.4 凝膠纖維分子順向度檢測....................................29
3.5 凝膠纖維之抗張強力及模數..................................30
3.6 凝膠纖維熱學性質分析......................................31
3.7 凝膠纖維表面型態觀測......................................32
四、結果與討論................................................33
4.1 UHMWPE凝膠溶液黏度與可紡性質..............................33
4.2 UHMWPE初絲的可延伸性質....................................37
4.3 UHMWPE初絲的表面型態......................................40
4.4 UHMWPE初絲的結晶度與熱學性質..............................44
4.5 UHMWPE初絲的雙折射性質....................................55
4.6 UHMWPE初絲的抗張性質......................................60
五、結論......................................................65
六、參考文獻..................................................67
作 者 簡 介...................................................71

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