Improved dimensional stability of Nafion membrane modified using a layer by layer self-assembly of biophilic polymers

详细信息	查看全文 | 推荐本文 |

• 作者：Hye Jin Lee^a ; ^{hyejinlee@knu.ac.kr} ; Eun Ji Nam^a ; Jung-Je Woo^b ; Seung-Hyeon Moon^b ; ^c ; Jaeyoung Lee^b ; ^c ; ^{jaeyoung@gist.ac.kr}
• 关键词：Nafion ; Layer by layer self-assembly ; Biophilic polymer ; Dimensional stability ; Fuel cell ; Wettability
• 刊名：Current Applied Physics
• 出版年：2012
• 期刊代码：15_15671739
• 类别：ph
• 出版时间：September, 2012
• 卷：12
• 期：5
• 页码：1235-1238
• 文件大小：401 K

摘要

The modification of perfluorinated proton exchange membranes (e.g. Nafion) utilizing a layer by layer (LbL) electrostatic assembly of oppositely charged biophilic polymers such as poly-l-lysine as positive layer and dsDNA as a negative layer is developed to protect the interface between the catalyst layer and the membrane in a low temperature fuel cell. Various physicochemical measurements including water uptake, proton conductivity and surface tension were investigated for both the as-received Nafion and the biopolymeric LbL modified Nafion. The smaller water contact angle and the less swelling characteristics of the biopolymer modified Nafion membrane was founded compared to that of as-received Nafion. This clearly indicates that the more hydrophilic surface of biopolymeric layers on Nafion plays an important role in the enhanced dimensional stability. In addition, a potential hypothesis explaining the higher proton conductivity from the LbL biopolymeric film coated Nafion is suggested.