Novel polynorbornenes, poly(NBPYTPA), and poly (HNBPYTPA), containing chromophoric and electroactive groups were synthesized by ring-opening metathesis polymerization using Grubbs' catalysts and followed hydrogenation, respectively. The glass transition temperatures (T g ) of poly(NBPYTPA) and hydrogenated poly(HNBPYTPA) were 195 and 165 C, respectively. The 10% weight-loss temperatures of hydrogenated poly (HNBPYTPA) and poly(NBPYTPA) were up to 465 and 420 C, respectively. The photoluminescence emission spectra of poly (HNBPYTPA) showed strong solvatochromic property, revealing that poly(HNBPYTPA) underwent remarkable bathochromic shifts with an increase in solvent polarity. The cyclic voltammogram of poly(HNBPYTPA) film cast onto an indium tin oxide (ITO)-coated glass substrate exhibited two reversible oxidation redox couples at 0.8 and 1.2 V versus Ag/Ag þ in acetonitrile solution. The electrochromic characteristics of poly(HNBPYTPA) showed reversibility, with color changes from yellow to blue and then to red upon the application of potentials from 0 to 1.3 V. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 5350-5357, 2011
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 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 þ 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. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: [3248][3249][3250][3251][3252][3253][3254][3255][3256][3257][3258][3259] 2011
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