Probing proton dissociation in ionic polymers by means of in situ ATR-FTIR spectroscopy.
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.
Grosmaire
Lidwine
L
Institut Européen des Membranes, ENSCM, UM2, CNRS, Université de Montpellier II, CC047, Place Eugène Bataillon, 34095 Montpellier, France.
Castagnoni
Samuel
S
Huguet
Patrice
P
Sistat
Philippe
P
Boucher
Mario
M
Bouchard
Patrick
P
Bébin
Philippe
P
Deabate
Stefano
S
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
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