Colley, R. A., Budd, P. M., Owen, J. R. and Balderson, S.
Poly oxymethylene-oligo(oxyethylene) for use in subambient temperature electrochromic devices
Polymer International, 49, (4), . (doi:10.1002/(SICI)1097-0126(200004)49:4<371::AID-PI384>3.0.CO;2-7).
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Polymer electrolytes were prepared from oxymethylene-linked polyethylene glycol 200 with lithium perchlorate at O:Li mole ratios of 10, 25 and 70, and with zinc iodide at an O:Zn mole ratio of 70. At the higher salt concentrations (O:Li less than or equal to 25), the electrolytes were amorphous at temperatures down to -20 degrees C. Conductivity was measured over a range of temperatures (eg for O:Li = 25, sigma ranged from 4 x 10(-8) S cm(-1) at -10 degrees C to 2 x 10(-4) S cm(-1) at 70 degrees C). A prototype electrochromic device was constructed for which the progression of a colour front was temperature dependent. Such a device could be utilized as a time-temperature integrating sensor for indicating whether frozen goods have been stored correctly. (C) 2000 Society of Chemical Industry.
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