Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2008.12.050
Title: Restructure proton conducting channels by embedding starburst POSS-g-acrylonitrile oligomer in sulfonic perfluoro polymer matrix
Authors: Zhang, X.
Tay, S.W.
Liu, Z.
Hong, L. 
Keywords: Atom-transfer-radical polymerization
Direct methanol fuel cell
Hybrid nanoparticle
POSS
Proton conducting channel
Issue Date: 5-Mar-2009
Citation: Zhang, X., Tay, S.W., Liu, Z., Hong, L. (2009-03-05). Restructure proton conducting channels by embedding starburst POSS-g-acrylonitrile oligomer in sulfonic perfluoro polymer matrix. Journal of Membrane Science 329 (1-2) : 228-235. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2008.12.050
Abstract: Unique starburst nanoparticles are synthesized via grafting polyacrylonitrile short chains to the cubic polyhedral oligomeric silsesquioxane (POSS) by atom transfer radical polymerization (ATRP). Introduction of these branched nanoparticles (sb-POSS) into the sulfonic perfluoro polymer (SPFP, e.g. Nafion®) matrix in appropriate contents gives significant improvements in the performance of SPFP membranes as direct methanol fuel cell (DMFC). This enhancement is associated with the initial clustering of sb-POSS particles in the SPFP matrix when the sb-POSS content reaches to 5 wt.%. It has been found, from the differential scanning calorimetry (DSC) observation, that the SPFP molecules wage dual interactions on the sb-POSS particles, namely the hydrophobic perfluoro polymer chains of SPFP repel sb-POSS particles while the hydrophilic moieties associate with them. The content of sb-POSS strongly affects the assembly of hydrophilic channels in the membrane and, therefore, the membrane performance in a single direct methanol fuel cell (DMFC). The sb-POSS (5 wt.%)-SPFP composite membrane manifests an increase of 122% in power output of DMFC at 80 °C. In brief, this work offers a new insight into how the unique interactions between soft nanoparticles and amphiphilic polymer chains affects performances of proton exchange membranes (PEMs) in DMFC. © 2008 Elsevier B.V. All rights reserved.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/90031
ISSN: 03767388
DOI: 10.1016/j.memsci.2008.12.050
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