Grafting poly(phenylene oxide) with poly(vinylphosphonic acid) for fuel cell membranes

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1021/ma402254h Macromolecules, 47, 7, pp. 2175Macromolecules, 47, 7, pp. -2198Macromolecules, 47, 7, pp. , 2014 Ion transport by nanochannels in ion-containing aromatic copolymers Li, Nanwen; Guiver, Michael D. Ion Transport by Nanochannels in Ion-Containing Aromatic CopolymersThe search for the next generation of highly ion-conducting polymer electrolyte membranes has been a subject of intense research because of their potential applications in energy storage and transformation devices, such as fuel cells, vanadium flow batteries, membrane-based artificial photosynthesis, water electrolysis, or water treatment processes such as electrodialysis desalination. Nanochannels that contain ionic groups, through which "hydrated" ions can pass, are believed to be of key importance for efficient ion transport in polymer electrolytes membranes. In this Perspective, we present an overview of the approaches to induce ion-conducting nanochannel formation by selfassembly, using polymer architecture such as block or combshaped copolymers. The transport properties of ion-containing aromatic copolymers are examined to obtain an insight into the fundamental behavior of these materials, which are targeted toward applications in fuel cells and other electrochemical devices. Challenges in obtaining well-defined nanochannel morphologies, and possible strategies to improve transport properties in aromatic copolymers having structures with the potential to withstand operation in electrochemical/chemical devices, are discussed. Opportunities for the application of ion-containing aromatic copolymer membranes in fuel cells, vanadium flow batteries, membrane-based artificial photosynthesis, electrolysis, and electrodialysis are also reviewed. Research needs for further improvements in ionic conductivity and durability, and their applications are identified.

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“…The proton conductivity of fully hydrated acidic membranes was above 200 mS/cm at 120°C. 75 2.3. Clustered or Densely Sulfonated Copolymers.…”

Section: Proton Exchange Membranesmentioning

confidence: 99%

Ion Transport by Nanochannels in Ion-Containing Aromatic Copolymers

2014

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“…The 1629 cm −1 band assigned to the CC stretching mode is significantly weakened and new intensive bands at 1228 and 1027 cm −1 were observed, which are characteristic for the PO and PO stretching mode of poly(vinyl phosphonate)s [Fig. (C)] . The appearance of binding energies at 133.2 and 188.8 eV from phosphorus also evidenced the creation of PDEVP brushes on the microspheres (Supporting Information Fig.…”

Section: Resultsmentioning

confidence: 98%

Poly(vinylphosphonate)s functionalized polymer microspheres via rare earth metal-mediated group transfer polymerization

Yang

Liang

Salzinger

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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We demonstrate a facile, yet efficient method for the functionalization of crosslinked polystyrene (PS) microspheres with biocompatible poly(vinylphosphonate)s via the combination of a UV grafting polymerization and a surface-initiated group transfer polymerization. Self-initiated photografting and photopolymerization of ethylene glycol dimethacrylate results in direct photografting of poly(ethylene glycol dimethacrylate) on the PS microspheres with dangling methacrylate functionalities, which are used to immobilize ytterbocene complexes to form the surface-bound rare-earth metal catalyst system. The surfaceinitiated GTP of dialkyl vinylphosphonates from the initiator system leads to the functionalization of PS microspheres with poly(-vinylphosphonate) brushes. Polymerization kinetic investigation indicates that surface-initiated GTP leads to a constant and remarkably rapid weight gain of the microsphere (a microsphere weight increase of 600% within 3 min), owing to the highly living and efficient character of GTP. The surface-initiated GTP occurring inside the microsphere causes an accumulation of the tension between the polymer chains in the microsphere, which eventually induces fracture of the microsphere for longer polymerization time.

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“…poly(acrylates), poly(vinylalcohols), and poly(acrylamides), has been achieved by polymerization of the respective monomers or by post polymerization modification [7][8][9][10]. Introduction of the phosphonate moiety allows the preparation of precursors for the corresponding phosphonic acid [11,12]. Phosphonic acids are known to show strong interactions with metal oxides leading to various applications, such as adhesion promotion or corrosion inhibition [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%