臺灣博碩士論文加值系統

奈米級纖維因具有較小直徑及較大表面積而具有較廣泛的用途，如過濾材或防護衣等，其應用領域包含環境工程、生物科技、紡織、化工及電子等產業。靜電濾材(electret filters)表面具有靜電吸引作用，隨著帶電量的增加，微粒穿透力會逐漸減小。
本研究設置一電紡絲之奈米纖維製備系統，以聚甲基丙烯酸甲酯(poly(methyl methacrylate)，PMMA)為高分子聚合物，產生奈米級與次微米級之纖維，並添加不同介電材料進行基本性質評估，及量測纖維濾材壓力損失及帶電狀況之穿透效率。
研究結果顯示，TiO2/PMMA或BaTiO3/PMMA之纖維濾材經由XRD分析發現晶相結構沒有改變；電阻係數部分可以發現添加TiO2或BaTiO3之纖維電阻係數均有增加，並利用靜電穩定度觀察發現持久度較純PMMA纖維佳；本研究最終將纖維濾材應用於微粒收集之目的上，並利用電暈放電使纖維濾材帶電，結果顯示在充電情況下，纖維直徑540 ± 66 nm、1004 ± 75 nm及2148 ± 261 nm之純PMMA纖維濾材過濾效率從原本的89.0、61.1及23.0 %增加為95.7、71.1及43.5%；添加TiO2及BaTiO3之纖維濾材過濾效率為99.4、91.0及86.4 %。

Nanofibers that were produced using this technique offer the potential for wide variety of applications such as filtration for air or water, tissue engineering scaffolds, protective clothing and biomedical application etc. Due to the exceptional properties: high specific surface area, high aspect ratio and small pore sizes, for instance. The electrets filters surface has electrostatic attraction, as with the increase in electricity, particle penetration will gradually decrease.
An electrospinning system was set up in this study. Using PMMA to produce nano and submicro-nano fibers, and added different dielectric materials to assess the basic properties and measure the pressure drop and the penetration efficiency with charged.
The results of the study showed after added, the fibers’ crystalline structures didn’t change and the resistance coefficient increase. As the result of static stability, the TiO2/PMMA or BaTiO3/PMMA was better than pure PMMA fibers. The final purpose was using the fiber filters applied to the particles collected and its will charged by corona discharge. The collection efficiency of 540 ± 66 nm, 1004 ± 75 nm, and 2148 ± 261 nm filters increased from 89.0 to 95.7 %, 61.1 to 71.1 %, and 23.0 to 43.5 %, respectively, as charging under 12 kV. In addition, mixing the capacitor material with PMMA of 540 ± 66 nm, 1004 ± 75 nm, and 2148 ± 261 nm filters could increase the collection efficiency from 95.7 to 99.4 %, 71.1 to 91.0 %, and 43.5 to 86.4 %, respectively.

摘 要 i
ABSTRACT ii
致 謝 iii
目 錄 iv
表 目 錄 vi
圖 目 錄 vii
第一章　緒論 1
1.1 研究背景 1
1.2 研究目的 2
1.3 研究架構與流程 3
第二章　文獻回顧 4
2.1 靜電纖維濾材過濾 4
2.2 纖維濾材之帶電量 4
2.3 微粒沈降機制 6
2.4 材料特性 8
2.4.1 PMMA之基本特性 8
2.4.2 介電材料 9
2.5 纖維濾材製備 10
2.5.1 電紡絲技術 10
2.5.2 纖維收集方法 11
2.5.3 電紡絲紡織過程 12
2.5.4 電紡絲纖維形態影響因素 13
2.5.5 各種聚合物製成之電紡絲纖維 14
第三章　研究方法 16
3.1 實驗藥品 17
3.2 實驗儀器與材料 18
3.2.1 電紡絲儀器 18
3.2.2 實驗分析設備 19
3.2.3 纖維濾材實驗與量測儀器 21
3.3 實驗方法 24
3.3.1 電紡絲技術製備纖維濾材 24
3.3.2 纖維形態及纖維基本特性 27
3.3.3 纖維濾材穿透與壓降測試 29
3.3.4 纖維濾材充電與表面電壓量測 31
3.3.5 纖維濾材效率與過濾品質理論計算 33
第四章　結果與討論 34
4.1 電紡絲製備纖維之基本性質 34
4.1.1纖維濾材型態 34
4.1.2 纖維之元素分析 44
4.1.3 纖維之XRD分析 46
4.1.4 纖維之介電常數量測 48
4.1.5 纖維之電阻量測 48
4.2 纖維濾材特性 49
4.2.1 纖維濾材影響因素 49
4.2.2 不同表面風速之纖維濾材壓力損失 51
4.2.3 纖維濾材之靜電穩定度 52
4.3 纖維濾材穿透效率 54
4.3.1 微粒粒徑分佈 54
4.3.2帶電對纖維濾材穿透效率之影響 55
4.3.3 纖維濾材之過濾品質 58
第五章　結論與建議 61
5.1 結論 61
5.2 建議 62
參考文獻 63

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