Rubidium Impurity Diffusion in a Poly(ethylene oxide)−Sodium Iodide Polymer Electrolyte

Obeidi, Sh.; Stolwijk, N. A.

doi:10.1021/jp064105l

Cited by 7 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FT-IR and impedance measurements were also in agreement with these SANS results indicating a predominance of ion pairs and their coupled transport within the polyphosphazene. This is furthermore in agreement with recent results on the role of ion pairs in ion transport of polymer electrolytes. − Of course, one cannot exclude the presence and contribution of higher ion clusters besides ion pairs.…”

Section: Discussionsupporting

confidence: 90%

“…This is furthermore in agreement with recent results on the role of ion pairs in ion transport of polymer electrolytes. [49][50][51] Of course, one cannot exclude the presence and contribution of higher ion clusters besides ion pairs. Despite the weak interaction between polymer and salt, the ionic conductivity was rather high and comparable to that of MEEP-based polymer electrolytes.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

SANS Investigation and Conductivity of Pure and Salt-Containing Poly(bismethoxyphosphazene)

et al. 2008

View full text Add to dashboard Cite

Poly(bismethoxyphosphazene) (PBMP) was synthesized, giving polymer melts with T g ) -70.9 °C. The chain dynamics of melts and DMF solutions of poly(bismethoxyphosphazene) (PBMP) was investigated by Small-Angle Neutron Scattering (SANS). The radius of gyration R g was found as 144.7 ( 0.2 Å, and the average MW from SANS was 95000 Da. DMF revealed to be a good solvent for this polymer. From the scattering intensity of polymer solutions for high q-data, the slope was -1.647 in almost exact agreement with the expected excluded volume exponent by Flory which is 5 / 3 affirming the good solvent property of DMF. GPC measurements of THF solutions were evaluated based on a universal calibration of polystyrene standards resulting in a rather similar value of 1.05 × 10 5 Da. Another series of SANS experiments was done with solutions of LiSO 3 CF 3 (LiTf) in the title polymer. They also showed low T g values down to -50 °C at 15 wt %. The SANS results (5 and 10 mol % LiTf as referred to the monomer units) showed almost no effect of the dissolved salt on the melt conformation of the polyphosphazene (almost random coil), and thus revealed a rather small interaction between salt and polymer. We also measured the ionic conductivity of salt-in-polymer systems with concentrations from 5 to 20 wt % LiTf. The room-temperature conductivity was 1.7 × 10 -5 S/cm at 20 wt % LiTf and is thus rather high. The low interaction between salt and polymeric solvent is in agreement with the predominance of neutral ion pairs which is often observed in such polymer electrolytes.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%