Conductive polymer blends as electrochromic materials

Conductive polymer blends were prepared mixing conductive and insulating po lymers and their electrochemical and electrochromic properties were studied . Depending on the insulator matrix used, these properties are not changed. Blend containing polyacrylonitrile and poly(o-methoxyaniline) doped with p -toluene sulfonic acid presents the same electrochemical and electrochromic behavior as the pure conducting polymer. Other blends studied were those o btained by combining poly(epichlorohydrin-co-ethylene oxide) with poly(o-me thoxyaniline) and poly(4,4'-dipentoxy-2,2'-bithiophene). An electrochromic device using these polymer blends and a liquid electrolyte was assembled an d presented Delta%T-620 (nm) = 56%. This contrast decreased after 300 doubl e potential steps to 33%. (C) 1999 Elsevier Science Ltd. All rights reserve d.