Structure and conductivity in LB films of low-dimensional polymer electrolytes
- 22 December 1999
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 10 (1) , 69-77
- https://doi.org/10.1039/a903000j
Abstract
LB films and bulk samples of complexes of (CF3SO2)2NLi and LiClO4 with polymers CH2OCH2- [(C6H3OR)CH2O(CH2OCH2)n−1] where R = –C16H33 or –C18H37 and n = 5 have been compared. Three-component systems incorporating equimolar proportions to the repeating unit of ‘expander' C16H33OH or C18H38 are also discussed. The laminar structures of the complexes have been modelled by molecular dynamics. The LB multilayer films (400–600 Å) have been characterised using surface pressure–area isotherms, low angle X-ray scattering and impedance spectroscopy. Conductivity measurements both in the plane of the films and normal to the plane are reported and compared with measurements on bulk (100 μm) films. Temperature-independent conductivity is observed in the ‘normal-to-plane' LB measurements. We propose that a morphological transformation occurs at the first heating during which the ion-mobile interlamellar planes become oriented normal to the electrodes.Keywords
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