Direct Analysis of the Ion-hopping Process Associated with the a-Relaxation in Perfluorosulfonate Ionomers using Quasielastic Neutron Scattering

Published

March 23, 2009

Author(s)

Kirt A. Page, Jong K. Park, R B. Moore, Victoria Garcia Sakai

Abstract

This work demonstrates the ability of quasi-elastic neutron scattering (QENS) to measure the dynamics associated with counterions in perfluorosulfonate ionomers (PFSIs).  PFSI membranes were prepared by neutralizing with hydrogenated alky ammonium counterions.  Counterion dynamics were measured using the High-Flux Back-scattering Spectrometer at the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR). The data presented here show the link between the onset of long-range counterion mobility and the mechanical properties of these materials. These data provide further fundamental understanding of the link between electrostatic interactions and dynamics in PFSI materials.

Citation

Macromolecules

Volume

42

Issue

7

Pub Type

Journals

Download Paper

https://doi.org/10.1021/ma801533h

Keywords

fuel cell membrane, ionomer, dynamics, QENS, counterion

Citation

Page, K. , Park, J. , Moore, R. and Garcia, V. (2009), Direct Analysis of the Ion-hopping Process Associated with the a-Relaxation in Perfluorosulfonate Ionomers using Quasielastic Neutron Scattering, Macromolecules, [online], https://doi.org/10.1021/ma801533h (Accessed April 24, 2024)