title: Origin of α and β relaxations of Nafion.
abstract: Our experiments disentangle the low and high frequency dispersions in perfluorosulfonate ionomer solutions and membranes, providing a reasonable model for understanding these relaxations. Dielectric spectroscopy (DS) and small angle x-ray scattering (SAXS) measurements revealed that the dielectric relaxations observed at low (α relaxation) and high (β relaxation) frequencies show typical features of the longitudinal and radial polarization, respectively, of rodlike polymeric aggregates. Such relaxations were attributed to counterion fluctuations in the vicinity of sulfonic acid groups, in resemblance with polyelectrolytes. Characteristic correlation lengths calculated from both DS and SAXS data are in good agreement adding further evidence to the proposed model. Such description provides insights for the understanding of the crossover from polyelectrolytes, dominated by charge repulsion, to ionomers, dominated by dipolar attraction.
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares, IPEN, São Paulo, SP, Avenida Lineu Prestes, 2242, 05508000, Brazil.
authors.forename: B R
authors.initials: BR
authors.lastname: Matos
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares, IPEN, São Paulo, SP, Avenida Lineu Prestes, 2242, 05508000, Brazil.
authors.forename: E I
authors.initials: EI
authors.lastname: Santiago
authors.affiliation: Universidade Federal do ABC, UFABC, Santo André, SP, Avenida dos Estados, 5001, 09219170, Brazil.
authors.forename: J F Q
authors.initials: JF
authors.lastname: Rey
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares, IPEN, São Paulo, SP, Avenida Lineu Prestes, 2242, 05508000, Brazil.
authors.forename: F C
authors.initials: FC
authors.lastname: Fonseca
mesh_terms: D058266:Dielectric Spectroscopy; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D008567:Membranes, Artificial; D008956:Models, Chemical; D009038:Motion; D053838:Scattering, Small Angle; D012996:Solutions; D013464:Sulfuric Acids / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D005465:Fluorocarbon Polymers; D008567:Membranes, Artificial; D012996:Solutions; D013464:Sulfuric Acids; D014867:Water; C040402:perfluorosulfonic acid; C033158:sulfuric acid