s-PSU纖維補強PBI複合膜與PBI纖維補強Nafion複合膜製備與性能研究

Fabrication and Characterization of Polybenzimidazole/ Sulfonated Polysulfone Nanofiber Composite Membranes and Nafion/ Polybenzimidazole Nanofiber Composite Membrane

張欽宗(Chin-Tsung Chang)

指導教授 ： 余子隆

共同指導教授 ： 林秀麗

元智大學/工程學院/化學工程與材料科學學系/碩士(2008年)

摘要

論文包括兩項工作：(1)s-PSU奈米纖維補強PBI複合膜；(2)PBI奈米纖維補強Nafion複合膜。
(1)使用聚砜(Polysulfone, PSU)/DMAc溶液利用電紡絲技術製備微米~奈米纖維膜。並將PSU纖維膜改質成磺酸化s-PSU纖維膜。以s-PSU奈米纖維膜為基材，以刮刀塗佈PBI/DMAc溶液製作PBI/s-PSU纖維複合。將複合膜與商用電極貼合製作膜電極組(MEA)並進行高溫單電池測試，測試結果OCV達0.7 V，但電流密度仍偏低，可能是複合膜表面的孔洞影響單電池效能。
(2)使用聚苯咪唑(Polybenzimidazole, PBI)溶液製備PBI電紡纖維，探討不同的電紡操作參數對纖維直徑的影響。並以PBI奈米纖維補強Nafion製作PBI奈米纖維補強Nafion複合膜。由SEM觀察，Nafion填滿整個PBI纖維膜。以此複合膜製作MEA進行單電池測試結果OCV達0.914 V，略小於Nafion 212膜材，但效能與Nafion 212並無太大差異。

關鍵字

靜電紡絲 ； 聚苯咪唑 ； Nafion ； 複合膜

並列摘要

Using electrospinning technology, we prepared two kinds of nano-fiber films from sulfonated polysulfone(s-PSU) solution and polybenzimidazole(PBI) solution. The nano-fiber films were used as matrices to prepare PBI/s-PSU fiber composite membrane and Nafion/PBI fiber composite membrane by immersing s-PSU nano-fiber film in a PBI/DMAc solution, and PBI nano-fiber film in a Nafion® solution.
From SEM micro-graphs of the surface and cross-section of these two composite membranes, we found the basic materials were filled into the fiber support materials. The single cell test and PEMFC performance analysis showed the OCV of MEA prepared from PBI/s-PSU fiber composite membrane had reached 0.7 V in high temperature PEMFC but the maximum power density was around 39.05 mW/cm2 at 120℃. The OCV of Nafion/PBI fiber composite membrane had reached 0.914 V which was lower than that MEA prepared from Nafion-212 membrane, but the maximum power density of Nafion/PBI fiber membrane was close to that of Nafion-212.

並列關鍵字

Nafion ； polybenzimidazole ； sulfonated polysulfone ； electrospinning ； composite membrane

參考文獻

Asensio J. A., Borrós S., Pedro G. R., ”Proton-conducting polymers based on benzimidazoles and sulfonated benzimidezoles,” Journal of Polymer Science: Part A: Polymer Chemistry, 40, 3703-3710 (2002).

Chen S.L., Bocarsly A.B., Benziger J., ”Nafion-layered sulfonated polysulfone fuel cell membranes,” Journal of Power Sources, 152, 27-33 (2005).

Chen Y., Li X.S., Song T.Y., “Electrospinning and Crosslinking of Zein Nanofiber Mats,” Journal of Applied Polymer Science, 103, 380-385 (2007).

Dudgeon C. D., Vogl O., “Bisorthoesters as polymer intermediates. II. A facile method for the preparation of polybenzimidazoles,” Journal of Polymer Science: Polymer Chemistry Edition, 16, 1831-1852 (1978).

Fong H., Chun I., Reneker D.H., “Beaded nanofibers formed during electrospinning,” Polymer, 40, 4585-4592 (1999).