Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2005.07.004
Title: Embedded polymerization driven asymmetric PEM for direct methanol fuel cells
Authors: Pei, H.
Hong, L. 
Lee, J.Y. 
Keywords: AMPS
Asymmetric laminar structure
Embedded polymerization
PEM
Issue Date: 15-Feb-2006
Citation: Pei, H., Hong, L., Lee, J.Y. (2006-02-15). Embedded polymerization driven asymmetric PEM for direct methanol fuel cells. Journal of Membrane Science 270 (1-2) : 169-178. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2005.07.004
Abstract: This work reports the fabrication of proton exchange membranes (PEM) with stronger resistance to methanol penetration than Nafion®117. A three-component acrylic polymer blend (TCPB) consisting of a copolymer of 4-vinylphenol-methyl methacrylate, poly(butyl methacrylate) (PBMA) and a copolymer of methyl methacrylate-ethyl acrylate is used as the methanol barrier. In order to implant a proton source phase within the membrane as homogeneously as possible, the hydrophilic monomers, 2-acrylamido-2-methyl propanesulfonic acid (AMPS), 2-hydroxyethyl methacrylate (HEMA) and poly(ethylene glycol) dimethylacrylate (PEGDMA), are polymerized only after they have been embedded in the TCPB matrix. The embedded polymerization has resulted in an asymmetric membrane structure, in which the hydrophilic network is sandwiched by two layers of matrixes with high percentages of TCPB. As expected, this asymmetric membrane structure exhibits lower methanol uptake than Nafion®117; and a proton conductivity in the range of 10-3-10-4 S/cm, which is dependent on the concentration of the sulfonic acid content. It is suggested that the two external layers in this asymmetric membrane provide primarily methanol-blocking and supporting proton-conducting properties; while the middle layer supplies protons and conserves water. This unique sandwiched PEM structure from embedded polymerization is confirmed by microstructure characterizations and by physical property measurements. © 2005 Elsevier B.V. All rights reserved.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/88830
ISSN: 03767388
DOI: 10.1016/j.memsci.2005.07.004
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