Theoretical and experimental infrared spectra of hydrated and dehydrated sulfonated poly(ether ether ketone)

Authors

Jonathan Doan
Erin Kingston
Ian Kendrick
Kierstyn Anderson
N. Dimakis, The University of Texas Rio Grande ValleyFollow
Philippe Knauth
Maria Luisa Di Vona
Eugene S. Smotkina

Document Type

Article

Publication Date

9-2-2014

Abstract

Time-dependent FT-IR spectra of sulfonated poly(ether ether ketone) during dehydration show diminishing 1081 cm−1 and 1023 cm−1 band intensities concurrent with the emergence and shifting of bands at 1362 cm−1 and 898 cm−1. Animations of density functional theory calculated normal modes enable assignment of the 1081 cm−1 and 1023 cm−1 bands as group modes that include a sulfonate exchange site with C3v local symmetry, while the 1362 cm−1 and 898 cm−1 bands are assigned as group modes that include an associated sulfonic acid with no local symmetry (C1). In contrast to analogously assigned Nafion group mode bands, the SPEEK C3v and C1 bands coexist throughout the entire dehydration–hydration cycle, suggesting the presence of associated and dissociated exchange sites in SPEEK at all states-of-hydration. This supports a morphological model for SPEEK featuring branched hydrophilic domains and dead-end aqueous confines.

Comments

Original published version available at https://doi.org/10.1016/j.polymer.2014.07.011

Recommended Citation

Doan, Jonathan, et al. "Theoretical and experimental infrared spectra of hydrated and dehydrated sulfonated poly (ether ether ketone)." Polymer 55.18 (2014): 4671-4676. https://doi.org/10.1016/j.polymer.2014.07.011

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.

Publication Title

Polymer

DOI

10.1016/j.polymer.2014.07.011