화학공학소재연구정보센터
Journal of Polymer Science Part A: Polymer Chemistry, Vol.49, No.15, 3248-3259, 2011
Preparation of Neutrally Colorless, Transparent Polynorbornenes with Multiple Redox-Active Chromophores via Ring-Opening Metathesis Polymerization Toward Electrochromic Applications
A new electrochromic norbornene derivative containing triphenylamine groups (NBDTPAC8) was synthesized using norbornene amine and bromotriphenylamine. NBDTPAC8 was used in ring-opening metathesis polymerization to obtain poly (NBDTPAC8) using different Grubbs' catalysts and followed by hydrogen reduction to obtain poly(HNBDTPAC8). The glass transition temperatures (T(g)) of poly(NBDTPAC8) and hydrogenated poly(HNBDTPAC8) were 132 and 89 degrees C, respectively. Poly (HNBDTPAC8) film exhibited a fluorescence maximum around 416 nm with a quantum yield of up to 60%. Hydrogenated poly (HNBDTPAC8) film showed excellent transparency (up to 93%). Poly(HNBDTPAC8) showed cyclic voltammetric and electrochromic behaviors similar to those of poly(NBDTPAC8). The cyclic voltammogram of a poly(HNBDTPAC8) film cast onto an indium tin oxide (ITO)-coated glass substrate exhibited three reversible oxidation redox couples at 0.69, 0.94 and 1.38 V versus Ag/Ag(+) in an acetonitrile solution. The electrochromic characteristics of poly(HNBDTPAC8) showed excellent stability and reversibility, with multi-staged color changes from its colorless neutral form to green, light blue and dark blue upon the application of potentials ranging from 0 to 1.60 V. The color switching time and bleaching time of the poly(HNBDTPAC8) film were 6.2 s and 4.3 s at 1175 nm and 6.6 s and 4.4 s at 970 nm, respectively. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 3248-3259, 2011