수지상 폴리(알릴렌 이써 설폰)에 도입된 지방족 알킬사슬 연결자길이에 따른 음이온교환막의 특성 연구

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 33; no. 3; pp. 209 - 218
• Main Authors: 김현진(HYUN JIN KIM), 유동진(DONG JIN YOO)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2022
• Subjects: Spacer(연결자); Ion conductivity(이온 전도도); Branched structure(수지상 구조); Anion exchange membrane(음이온교환막); Fuel cell(연료전지)
• ISSN: 1738-7264; 2288-7407
• DOI: 10.7316/KHNES.2022.33.3.209

Recently, research on the development of anion exchange membranes (AEMs) has received considerable attention from the scientific community around the world. Here, we fabricated a series of AEMs with branched structures with different alkyl spacers and conducted comparative evaluations. The introduction of these branched structures is an attempt to overcome the low ionic conductivity and stability problems that AEMs are currently facing. To this end, branched polymers with different spacer lengths were synthesized and properties of each membrane prepared according to the branched structure were compared. The chemical structure of the polymer was investigated by proton nuclear magnetic resonance, Fourier transform infrared, and gel permeation chromatography, and the thermal properties were investigated using thermogravimetric analysis. The branched anion exchange membrane with (CH2)3 and (CH2)6 spacers exhibited ionic conductivities of 8.9 mS cm-1 and 22 mS cm-1 at 90℃, respectively. This means that the length of the spacer affects the ionic conductivity. Therefore, this study showing the effect of the spacer length on the ionic conductivity of the membrane in the polymer structure constituting the ion exchange membrane is judged to be very useful for future application studies of AEM fuel cells.