聚苯咪唑與丁基磺酸聚苯咪唑摻合薄膜

Membranes of polybenzimidazole and sulfonated-butyl plybenzimidazole blend

胡志仁(Chih-Ren Hu)

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(2007年)

摘要

摘要
本論文的研究目的是將polybenzimidazole(PBI)和不同磺酸化比例的polybenzimidazole-butanesultone (PBI-BS) ，以不同的重量比例去製備出PBI/PBI-BS的複合膜，使PBI/PBI-BS摻合膜材可應用於燃料電池。我們利用FTIR來鑑定合成出的PBI和PBI-BS，元素分析儀(EA)來計算得到PBI-BS的磺酸化比例。以SEM (Scanning Electron Microscope)來觀察膜材表面結構，萬能材料試驗機測定膜材的抗張強度及延伸率，交流阻儀(AC impedance)測定膜材導電度，TGA (thermogravimetric analysis)測定膜材熱穩定性，密度計測定甲醇滲透率，並將PBI、PBI-BS、PBI/PBI-BS-22(重量比9/1〜7/3)製作成膜電極組(MEA)，以單電池測試系統測試MEA在140℃、160℃、180℃質子交換膜燃料電池(PEMFC)的單電池效能。
在摻合膜材的部份，以摻合比例為8:2和7:3所製成的MEA有較佳的表現；在溫度為180oC，氫氣及氧氣皆為300 ml/min的條件下，最大功率為162 mW/cm2 和165 mW/cm2，最大電流密度為880 mA/cm2 和 900mA/cm2；二者的最大功率及電流密度皆比純的PBI膜來的高。

關鍵字

PBI ； PBI membrane ； Fuel cells

並列摘要

Abstract

In this thesis Poly(benzimidazole) and sulfobutylated poly(benzimidazole) (PBI-BS) with various levels of sulfonation were synthesized. The PBI, PBI-BS, and various ratios of PBI/PBI-BS composite membranes were fabricated. The polymer structures and sulfonation level of PBI-BS were identified by FTIR spectroscopy, and elemental analysis. The physical properties of these membranes were investigated, including mechanical strength, thermogravimetric analysis, methanol permeability, gas permeability and conductivity. All of these membranes including PBI, PBI-BS and PBI/PBI-BS were than impregnating with phosphoric acid solution and were used to prepare membrane electrolyte assembly (MEA). These membrane were tested at 140oC to 180oC with pure oxygen and hydrogen and a flow rate of 300 ml min-1. In this study, we showed that PBI/PBI-BS composite membranes had better PEMFC performance than PBI at 140oC to 180oC.

並列關鍵字

PBI ； PBI薄膜 ； PBI摻合

參考文獻

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