Molecular Mobility, Ion Mobility, and Mobile Ion Concentration in Poly(ethylene oxide)-Based Polyurethane Ionomers

Abstract

The segmental and local chain dynamics as well as the transport of Na+ and Li+ cations in a series of model poly(ethylene oxide)-based polyurethane ionomers is investigated using dielectric relaxation spectroscopy. A physical model of electrode polarization is employed to separately determine mobile ion concentration and ion mobility in these single-ion conductors. A model including unpaired ions, separated ion pairs, and contact ion pairs is used to reconcile the very small fraction of free ions obtained using the electrode polarization model with those of previous studies of ion association in polyether-based single-ion conducting and salt-containing systems.

Tailoring the Structural, Morphological, Electrochemical, and Dielectric Properties of Solid Polymer Electrolyte

“…At this frequency electrode polarization starts to build up and on moving toward decreasing frequency, maxima in ′′ is observed associated with the maximum frequency ( ). It implies that, at this frequency maximum polarization is achieved [77,[78][79][80]. It is also observed ′ starts decreasing when the maxima in ′′ is observed as evidenced form the Figure 12 a & b.…”

The crystallization and morphology of melt-miscible polymer blends

“…The same information can be obtained directly using electron microscopy. SAXS and electron microscopy investigations of polymer blends in which at least one component is crystallizable show that in some cases the interlamellar periodicity is significantly increased by the presence of the other component [4][5][6][7][8][9][10][11][12][13], and in some cases an increase in periodicity is either absent or weak [14][15][16][17]. The measurement of long periods using SAXS can be used to quantitatively assess the disposition of B between interlamellar and interfibrillar regions.…”

Dielectric Relaxation and Ionic Conductivity of a Chitosan/Poly(ethylene oxide) Blend Doped with Potassium and Calcium Cations

“…This huge increase of e ', accompanied by even more significant increases of e " (top panels), is unequivocally attributed to the electrode polarization (EP) [13][14][15][16] that reflects the large-scale ion motion/ diffusion between the electrodes. The neat blend contains no salt, and H + dissociated from the acetic acid is the charge carrier resulting in EP.…”