%0 journal article
%@ 1022-1352
%A Roeder, J.,Gomes, D.,Ponce, M.L.,Abetz, V.,Pereira Nunes, S.
%D 2007
%J Macromolecular Chemistry and Physics
%N 
%P 467-473 
%R doi:10.1002/macp.200600515
%T Protonation of Sulfonated Poly(4,4’-diphenylether-1,3,4-oxadiazole) Membranes
%U https://doi.org/10.1002/macp.200600515
 
%X This work describes the effect of sulfuric acid protonation on the properties of SPOD-DPE membranes using FT-IR and impedance spectroscopic analyses. The IR spectra showed the protonation of nitrogen atoms from oxadiazole rings, with a broad band complex in the region 3 000–2 100 cm1 with two centered peaks at 2 590 and 2 440 cm1. The S––O characteristic,absorption bands in SPOD-DPE and sulfuric acid were specially studied in the region of 1 800–900 cm1. The,band shifts are associated to the interaction between acid groups and oxadiazole ring nitrogen atoms. The IR spectra evidenced the presence of three absorption species (HSO4, SO2 4 and free H2SO4) depending on the sulfuric acid concentration. For the protonated SPOD-DPE membranes, a proton conductivity around 10 mScm1 was reached at 50 8C.