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  • Vibrational spectroscopic study of ionic association in poly(ethylene oxide)-NH4SCN polymer electrolytes.

Vibrational spectroscopic study of ionic association in poly(ethylene oxide)-NH4SCN polymer electrolytes.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2008-09-02)
Hucheng Zhang, Jianji Wang
ABSTRACT

The polymer-ammonium complexes are an important class of proton conducting polymer electrolytes. In this work, poly(ethylene oxide) (PEO)-NH(4)SCN electrolytes were prepared over a large range of the salt content, and their FT-IR spectra were measured at room temperature. Based on the assignments of each band in the spectral envelope of SCN(-1), their relative intensities are determined by the use of FT-IR technique. Following the experimental results and spectral analyses, this paper reports the interactions, the various ionic associations, the changes of the ionic association with NH(4)SCN content, and the characteristics of structure in PEO-NH(4)SCN electrolytes. It is shown that the hydrogen bonds of PEO and NH(4)SCN exert the great effect to the ionic association, the interactions of PEO with NH(4)SCN, and PEO crystallinity, in particular, under the condition of high NH(4)SCN content. In addition, the differences of ionic association among PEO-NaSCN, PEO-KSCN and NH(4)SCN electrolytes are also compared in this paper.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ammonium thiocyanate solution, 0.1 M, 1/10 N
Sigma-Aldrich
Ammonium thiocyanate, SAJ special grade, ≥99%
Sigma-Aldrich
Ammonium thiocyanate, powder
Sigma-Aldrich
Ammonium thiocyanate, ACS reagent, ≥97.5%
Supelco
Ammonium thiocyanate, 99.99% trace metals basis