title: Probing proton dissociation in ionic polymers by means of in situ ATR-FTIR spectroscopy.
abstract: The hydration process of cationic membrane protogenic groups was investigated using in situ ATR-FTIR spectroscopy. The aim of this study is to provide a relationship between the hydration degree of the membrane and the dissociation state of exchange sites inside the polymer material. IR spectra were recorded by means of an environmental device specifically manufactured to allow the control of water vapour pressure in equilibrium with the sample. The behaviour of Nafion 112 and sulfonated poly(ether ether ketone) (S-PEEK), in both proton and sodium forms, was compared. IR data, analyzed and fitted in the 800-1850 cm(-1) spectral range, gave precise information on the assignment of sulfonic group vibrational modes. The results of this study improve the understanding of the transition phenomena between dissociated and undissociated states of the grafted sites in protonic conductors.
authors.affiliation: Institut Européen des Membranes, ENSCM, UM2, CNRS, Université de Montpellier II, CC047, Place Eugène Bataillon, 34095 Montpellier, France.
authors.forename: Lidwine
authors.initials: L
authors.lastname: Grosmaire
authors.forename: Samuel
authors.initials: S
authors.lastname: Castagnoni
authors.forename: Patrice
authors.initials: P
authors.lastname: Huguet
authors.forename: Philippe
authors.initials: P
authors.lastname: Sistat
authors.forename: Mario
authors.initials: M
authors.lastname: Boucher
authors.forename: Patrick
authors.initials: P
authors.lastname: Bouchard
authors.forename: Philippe
authors.initials: P
authors.lastname: Bébin
authors.forename: Stefano
authors.initials: S
authors.lastname: Deabate
mesh_terms: D001577:Benzophenones; D001672:Biocompatible Materials / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007659:Ketones / Q000737:chemistry*; D008567:Membranes, Artificial; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011522:Protons; D012964:Sodium / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013450:Sulfones / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D001577:Benzophenones; D001672:Biocompatible Materials; D007477:Ions; D007659:Ketones; D008567:Membranes, Artificial; D011108:Polymers; D011522:Protons; D013450:Sulfones; D014867:Water; C063834:polyetheretherketone; D011092:Polyethylene Glycols; D012964:Sodium