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Sulfonation of surface-initiated polynorbornene films / Brad J. Berron in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7707-7714 Titre : Sulfonation of surface-initiated polynorbornene films Type de document : texte imprimé Auteurs : Brad J. Berron, Auteur ; Andrew P. Payne, Auteur ; Kane G. Jennings, Auteur Année de publication : 2008 Article en page(s) : P. 7707-7714 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : polynorbornene  self-assembled  monolayer  (SAM)  ring-opening  metathesis  polymerization  (ROMP) Résumé : We report the sulfonation of surface-initiated polynorbornene with acetyl sulfate to produce ultrathin ionomer films. The complete process consists of exposure of a hydroxyl-terminated self-assembled monolayer (SAM) on gold to a norbornenyl diacid chloride, attachment of Grubbs first generation catalyst, ring-opening metathesis polymerization (ROMP), and sulfonation. Structural and chemical changes in the film upon sulfonation are confirmed by RAIRS, contact angle goniometry, ellipsometry, optical microscopy, and electrochemical impedance spectroscopy. Sulfonation of surface-initiated polynorbornene results in a highly nonuniform surface morphology which can be relaxed to a more uniform film through exposure to dimethyl sulfoxide at room temperature. The sulfonated polynorbornene films have an intermediate surface energy (θA(H2O) ≈ 75°) and a low resistance against proton transport (Rf ≈ 1.6 Ω·cm2), which is 6 orders of magnitude lower than that of the original polynorbornene film. The sulfonated films are far more stable than the original polynorbornene films because of a ∼95% diminution of olefin content within the film. Sulfonated poly(butylnorbornene) films were prepared analogously to demonstrate the versatility of this approach toward ionomer films. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800356a [article] Sulfonation of surface-initiated polynorbornene films [texte imprimé] / Brad J. Berron, Auteur ; Andrew P. Payne, Auteur ; Kane G. Jennings, Auteur . - 2008 . - P. 7707-7714. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7707-7714 Mots-clés : polynorbornene  self-assembled  monolayer  (SAM)  ring-opening  metathesis  polymerization  (ROMP) Résumé : We report the sulfonation of surface-initiated polynorbornene with acetyl sulfate to produce ultrathin ionomer films. The complete process consists of exposure of a hydroxyl-terminated self-assembled monolayer (SAM) on gold to a norbornenyl diacid chloride, attachment of Grubbs first generation catalyst, ring-opening metathesis polymerization (ROMP), and sulfonation. Structural and chemical changes in the film upon sulfonation are confirmed by RAIRS, contact angle goniometry, ellipsometry, optical microscopy, and electrochemical impedance spectroscopy. Sulfonation of surface-initiated polynorbornene results in a highly nonuniform surface morphology which can be relaxed to a more uniform film through exposure to dimethyl sulfoxide at room temperature. The sulfonated polynorbornene films have an intermediate surface energy (θA(H2O) ≈ 75°) and a low resistance against proton transport (Rf ≈ 1.6 Ω·cm2), which is 6 orders of magnitude lower than that of the original polynorbornene film. The sulfonated films are far more stable than the original polynorbornene films because of a ∼95% diminution of olefin content within the film. Sulfonated poly(butylnorbornene) films were prepared analogously to demonstrate the versatility of this approach toward ionomer films. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800356a