Glass Transition-Related Changes in Molecular Mobility below Glass Transition Temperature of Freeze-Dried Formulations, as Measured by Dielectric Spectroscopy and Solid State Nuclear Magnetic Resonance

2005 ◽  
Vol 94 (2) ◽  
pp. 275-287 ◽  
Author(s):  
Sumie Yoshioka ◽  
Yukio Aso
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Solid State ◽  
Magnetic Resonance ◽  
Molecular Mobility ◽  
Dielectric Spectroscopy ◽  
Freeze Dried ◽  
Nuclear Magnetic

scholarly journals Polymer Electrolytes with Exclusively Cationic Conductivity

1988 ◽  
Vol 135 ◽  
Author(s):  
H. Liu ◽  
Y. Okamoto ◽  
T. Skotheim ◽  
Y. S. Pak ◽  
S. G. Greenbaum ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Hydrostatic Pressure ◽  
Magnetic Resonance ◽  
Polymer Electrolytes ◽  
Ion Pair ◽  
Pair Formation ◽  
Motional Narrowing

AbstractThe synthesis of exclusively cation conducting polymer electrolytes based on a nylon-l backbone, ethylene-oxide side chains, and attached dibutyl phenolate anions is described. The tendency for ion pair formation appears to be reduced as the conductivity of the sodium-containing compound reaches −2 × 10−6 S-cm−1 at 50°C. 23Na nuclear magnetic resonance measurements demonstrate: i) motional narrowing of the mobile Na+ resonance above the glass transition temperature; ii) mobile Na+ concentrations of ∼75% at 40°C; iii) insensitivity of the linewidth to applied hydrostatic pressure up to 2 kbar. Similaries between these findings, and those in “conventional” polymer-salt electrolytes are discussed.

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