聚乙烯醇靜電紡絲研究-配方及程序之關鍵因子探討

Processing of Factors in Electrospinning of Poly(vinyl alcohol)

黃政強

指導教授 ： 芮祥鵬

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2007年)

摘要

綜合各項實驗指出，我們發現影響靜電紡絲過程之眾多因子中，溶液之總體拉伸黏度(Apparent Extensional viscosity)決定了靜電紡絲時，是否能穩定噴絲之關鍵因素。我們使用拉伸式流變儀(CaBER)來量測一系列聚乙烯醇(PVA)水溶液，並且用冪次定律流體(Power-Law Fluids)來模擬拉伸情形。模擬結果顯示，當溶液由拉伸變稀(Extensional thinning)轉變為拉伸變稠(Extensional thickening)時，便無法穩定噴絲。利用其它分子量之聚乙烯醇(PVA)水溶液，亦發現相同現象。進一步，透過靜電紡絲技術製造出具有光分解的聚乙烯醇奈米級纖維薄膜。在紫外光的照射下，發現隨著添加二氧化鈦比例越多，光照時間越長，其光分解效果越顯著。並利用動態機械分析儀(DMA)來分析纖維薄膜機械強度的變化，發現到添加少許二氧化鈦後，明顯降低了纖維薄膜的機械強度，尤其是韌度大幅度降低。

關鍵字

靜電紡絲 ； 聚乙烯醇 ； 拉伸式流變儀

並列摘要

Synthesizing many experiments conducted in this study, it was found that among many factors that influence electrospinning, the apparent extensional viscosity greatly determined whether the silk could be gushed out steadily. A series of polyvinyl alcohol (PVA) solution was measured via the Capillary Breakup Extensional Rheometer (CaBER), and the extensive situation was simulated with Power-Law Fluids. The results indicated that PVA solution could not be gushed out steadily when it was transformed into extensional thickening from extensional thinning. Identical phenomenon was found as well when PVA with different molecular weight was used. Furthermore, PVA nanofibers containing titanium dioxide (TiO2) was produced through electrospinning. Under the exposure of ultraviolet, it was discovered that the more titanium dioxide (TiO2) was added and the longer it was exposed. The more obvious the effect of photodissociation would be. And the change of the mechanical intensity of nanofibers was analyzed by means of the Dynamic Mechanical Analyzer (DMA). The analysis results revealed that after slight titanium dioxide (TiO2) had been added. The mechanical intensity of nanofibers was apparently reduced, especially the tenacity.

並列關鍵字

Electrospinning ； polyvinyl alcohol ； CaBER

參考文獻

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