本研究以靜電紡絲法製備聚乳酸奈米纖維薄膜，其具高比表面積、超細纖維及均勻的孔洞，聚乳酸本身為玉米提煉之環保性可分解原料，結合以上優點可運用在超高效能(HEPA)空氣過濾。然而，因靜電紡絲製備之薄膜強力低，故需結合紡粘不織布 (Spunbond nonwoven) 補強其不足，使其成為多層複合膜，稱之為SES三明治夾層結構 (Spunbpnd-Electrospun-Spunbond) 複合膜。
實驗第一部分為探討最佳靜電紡絲黏度，利用不同濃度之聚乳酸紡絲液進行測試，找出最佳電紡條件，操作濃度為8wt%、10wt%、12wt%，纖維直徑介於658nm~954nm，第二部份利用最佳靜電紡絲條件電壓25kV、幫浦速率0.5ml/hr、滾筒轉速條件為363rpm、452rpm及626rpm，並測得纖維基重介於7.5 g/m2~15.33g/m2，利用掃描式電子顯微鏡進行表面觀察，並探討上述之SES奈米纖維膜的條件對強力、孔隙率、孔徑及過濾效能的影響。
實驗結果顯示，纖維直徑會隨著紡絲液濃度及滾筒轉速增加而上升，而纖維薄膜強力隨著滾筒轉速快高而增加，在濃度8wt%且滾筒轉速363rpm時，可達最大強力1.66kgf。電紡薄膜孔徑會隨著滾筒轉速越快而增加，但與濃度無明顯的關係，但孔隙率則隨著濃度及滾筒轉速增加而提升，最後以不同顆粒大小(0.05μm~0.3μm)測得之過濾效能則以濃度8wt%及10wt%為較佳參數，其過濾效能於0.05μm時，過濾效能可達99.985%，在0.2μm時最大可趨近於100.00%，由此推斷由聚乳酸經電紡法所製備之奈米纖維濾膜可成為良好之過濾材料。

In this study, the Polylactic acid (PLA)-based membranes were manufactured by the technique of electrospinning. The BET characteristics of the nano-fibrous membranes had ultra-high surface area of fine and uniform pores. PLA is refined from a corn, which has great environmental characteristics and can be decomposed in the nature. With the above those characteristics, the PLA-based membranes are applied in the high efficiency particulate air (HEPA) filter. However, due to the lower strength of nano-fibrous membrane, the spunbond nonwoven was devised as a reinforcement material and combined the nano-fibrous membrane. It is a multi-layers filter material named Spunbond-Electronspun-Spunbond (SES) composite membrane.
The fiber diameter range of the PLA-based membranes approached 658nm~954nm as their spinning dope concentrations and flow rates reached their corresponding optimum values. To understand tensile properties, porosity, pore size, filtration efficiency and SEM morphology analysis of PLA-based membranes were performed in this study.
Experimental results show that, as the PLA concentration and roller speed decreases, the fiber diameter and strength tensile increases. The tensile strength value is 1.66 kgf of PLA-based membranes prepared using the optimum spinning dope concentration of 8wt%. Furthermore, even better filtration efficiency can be obtained for PLA-based membranes with optimum spinning dope concentration and even higher roller speeds. When the roller speed is increased, the pore size is increased, and when the PLA concentration and roller speed decreases.
The results infer that by controlling the experimental parameters will expect to obtain the best performance of SES, which can remove 99.97% of airborne particles 0.05 micrometers (μm) and 100.00% of airborne particles 0.2 micrometers (μm).

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