聚苯咪唑和聚醚砜電紡奈米纖維製備及性質研究

Fabrication and Characterization of Polybenzimidazole and Polysulfone Electrospin Nanofibers

張凱鑫(Kai-Hsin Chang)

指導教授 ： 余子隆

元智大學/工程學院/化學工程與材料科學學系/碩士(2006年)

摘要

直徑為微米~奈米的高分子纖維可藉由電紡絲製備。本研究使用高分子材料聚砜(Polysulfone, PSU)，探討PSU/DMAc(dimethyl acetamide)溶液在不同濃度(黏度)、導電度、流量、電壓與工作距離等操作變數對所製備之纖維形態、尺寸影響。實驗發現: 溶液濃度愈高、溶液流量大，形成的纖維愈粗，增加溶液導電度能有效消除串珠狀纖維結構(bead-fiber)，使其產生均一性纖維結構(uniform-fiber)，同時降低了纖維直徑分布。
本研究並且合成聚苯咪唑(Polybenzimidazole, PBI)，將PBI利用電紡絲技術加以製成奈米纖維膜材。將不同分子量的PBI/DMAc溶液藉由電紡絲技術製備出纖維材料。從SEM的觀察發現，因PBI分子量偏低，使用PBI/DMAc溶液無法製出連續均一性的奈米纖維膜材，因此使用PSU和PBI進行掺合使用的溶劑為二甲基乙醯胺(DMAc)，結果發現有明顯改善了受到分子量限制的問題，尚無法製備出連續性的纖維膜材。

關鍵字

電紡絲 ； 聚砜聚苯咪唑

並列摘要

The electrospinning is a straightforward method to produce polymer fibers from polymer solutions with diameters in the range from nano- to micro- scale. This main purpose of this research is to find the effects of concentrations (viscosity)、conductivity、flow rates of solutions, applied voltage and working distance on the properties of fibers spun from polysulfone/N,N’-dimethyl acetamide solutions, including morphology and fiber sizes. Experimental results indicate that : fiber diameter increases with increasing solution viscosity and flow rate. Increaseing conductivity of PSU solution reduces bead-fibers and fiber diameters.
Polybenzimidazole (PBI) was synthesized in the present work. We fabricated polybenzimidazole nanofiber membranes from polybenzimidazole/N,N’-dimethyl acetamide solutions by electrospinning. From SEM, only beaded-fibers were observed, because of low molecular weight of PBI. This problem might be solved by blending high molecular weight PSU into PBI/DMAc solutions, which caused more molecular entanglements.

並列關鍵字

Electrospinning ； Polysulfone(PSU) ； Polybenzimidazole (PBI)

參考文獻

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