Side chain relaxation
Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
New polymer hosts to form polymer electrolytes, poly[methoxy-oligo(ethylene oxide)-L-glutamate] (PMnEOG, n = 1, 2, 3 and 7, n stands for the number of ethylene oxide units), have been prepared in order to study the correlation between the side chain relaxation and the ionic conductivity of PMnEOG/LiClO4 complexes. The main chains of PMnEOGs form a rigid rod-like structure (α-helix structure) in the solid state both in the absence and the presence of LiClO4. The oligo(ethylene oxide) side chains begin to be mobile at temperatures lower than 0°C, while the rigid main chains do not move up to 100°C. The side chains show a preferential solvation of incorporated LiClO4. The ionic conductivity of 10-7-10-6S/cm is attained in PM3EOG/LiClO4 and PM7EOG/LiClO4 complexes at room temperature, where only the short side chain motion contributes to the ionic transport. The temperature dependencies of the side chain relaxation time and ionic conductivity increase with increasing the side chain length when the temperature dependencies are normalized by the temperatures based on the glass transition temperatures of the side chains, which indicates strong cooperation between the side chain motion and the ion transport. The possibility of fast ion transport by short side chain relaxation is discussed.
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