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Nano-scale morphology in graft copolymer proton-exchange membranes cross-linked with DIPB

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Title: Nano-scale morphology in graft copolymer proton-exchange membranes cross-linked with DIPB
Authors: Balog, Sandor1 sandor.balog@psi.ch, Gasser, Urs1, Mortensen, Kell2, Ben youcef, Hicham3, Gubler, Lorenz3, Scherer, Günther G.3
Source: Journal of Membrane Science. Nov2011, Vol. 383 Issue 1/2, p50-59. 10p.
Subjects: Ion-permeable membranes, Graft copolymers, Crosslinked polymers, Alpha-methylstyrol, Hydration, Nanostructures
Abstract: Abstract: The relationships between the nano-scale structure and the monomer composition of proton exchange membranes (PEMs) are reported. The PEMs are synthesized by preirradiation-induced grafting ETFE with styrene and cross-linker, 1,3-diisopropenylbenzene (DIPB), where the styrene moieties are sulfonated subsequently. The degree of grafting is constant, while the DIPB level is varied systematically. The SAXS spectra of the dry membranes are isotropic and dominated by a single correlation peak, which results from the phase separation of the ion-rich phase from the polymer matrix. By analyzing the correlation peak we find that the number density and the typical size of the ion-rich domains decrease when the level of cross-linking is increased. The proton conductivity in the fully hydrated state is proportional to the volume fraction of the ion-rich phase. This suggests that the structure of the ion-rich phase found in the dry state has fundamental impact on the conductivity of the hydrated membrane. The relationship between the proton conductivity and the water volume fraction follows a power law in good agreement with percolation theory. [Copyright &y& Elsevier]
Copyright of Journal of Membrane Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 66230161
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Nano-scale morphology in graft copolymer proton-exchange membranes cross-linked with DIPB
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Membrane+Science%22">Journal of Membrane Science</searchLink>. Nov2011, Vol. 383 Issue 1/2, p50-59. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Ion-permeable+membranes%22">Ion-permeable membranes</searchLink><br /><searchLink fieldCode="DE" term="%22Graft+copolymers%22">Graft copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Crosslinked+polymers%22">Crosslinked polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Alpha-methylstyrol%22">Alpha-methylstyrol</searchLink><br /><searchLink fieldCode="DE" term="%22Hydration%22">Hydration</searchLink><br /><searchLink fieldCode="DE" term="%22Nanostructures%22">Nanostructures</searchLink>
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  Data: Abstract: The relationships between the nano-scale structure and the monomer composition of proton exchange membranes (PEMs) are reported. The PEMs are synthesized by preirradiation-induced grafting ETFE with styrene and cross-linker, 1,3-diisopropenylbenzene (DIPB), where the styrene moieties are sulfonated subsequently. The degree of grafting is constant, while the DIPB level is varied systematically. The SAXS spectra of the dry membranes are isotropic and dominated by a single correlation peak, which results from the phase separation of the ion-rich phase from the polymer matrix. By analyzing the correlation peak we find that the number density and the typical size of the ion-rich domains decrease when the level of cross-linking is increased. The proton conductivity in the fully hydrated state is proportional to the volume fraction of the ion-rich phase. This suggests that the structure of the ion-rich phase found in the dry state has fundamental impact on the conductivity of the hydrated membrane. The relationship between the proton conductivity and the water volume fraction follows a power law in good agreement with percolation theory. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Journal of Membrane Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.memsci.2011.08.031
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 50
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      – SubjectFull: Ion-permeable membranes
        Type: general
      – SubjectFull: Graft copolymers
        Type: general
      – SubjectFull: Crosslinked polymers
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      – SubjectFull: Alpha-methylstyrol
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      – SubjectFull: Hydration
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      – SubjectFull: Nanostructures
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      – TitleFull: Nano-scale morphology in graft copolymer proton-exchange membranes cross-linked with DIPB
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              M: 11
              Text: Nov2011
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              Y: 2011
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