Poly[oxymethylene-oligo(oxyethylene)] for use in subambient temperature electrochromic devices

• Published in: Polymer international Vol. 49; no. 4; pp. 371 - 376
• Main Authors: Colley, Robert A, Budd, Peter M, Owen, John R, Balderson, Simon
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.04.2000
• Subjects: electrochromic device; polymer electrolyte; sensor; time-temperature integration
• ISSN: 0959-8103; 1097-0126
• DOI: 10.1002/(SICI)1097-0126(200004)49:4<371::AID-PI384>3.0.CO;2-7

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 ≤ 25), the electrolytes were amorphous at temperatures down to −20 °C. Conductivity was measured over a range of temperatures (eg for O:Li = 25, σ ranged from 4 × 10−8 S cm−1 at −10 °C to 2 × 10−4 S cm−1 at 70 °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. © 2000 Society of Chemical Industry