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• W2093180597 abstract "A new naphthylamine-derived aromatic dicarboxylic acid, 1-[N,N-di(4-carboxyphenyl)amino]naphthalene (2), was successfully synthesized by the sodium hydride-mediated condensation of 1-aminonaphthalene with 4-fluorobenzonitrile, followed by the alkaline hydrolysis of the intermediate dicyano compound 1. Four poly(amine−hydrazide)s were prepared from the polycondensation reactions of the dicarboxylic acid 2 and 4,4‘-dicarboxytriphenylamine (2‘) with terephthalic dihydrazide (TPH) and isophthalic dihydrazide (IPH), respectively, via the Yamazaki phosphorylation reaction. The poly(amine−hydrazide)s were readily soluble in many common organic solvents and could be solution cast into transparent and flexible films with good mechanical properties. These hydrazide polymers had glass-transition temperatures (Tg) in the range of 182−230 °C and could be thermally cyclodehydrated into the corresponding oxadiazole polymers in the range of 300−400 °C. The resulting poly(amine−1,3,4-oxadiazole)s had useful levels of thermal stability associated with high Tg (263−277 °C), 10% weight-loss temperatures in excess of 500 °C, and char yield at 800 °C in nitrogen higher than 54%. These polymers exhibited maximum UV−vis absorption at 344−391 and 352−391 nm in NMP solution and solid-state films, respectively. Their photoluminescence spectra in NMP solution showed maximum bands around 495−529 and 457−476 nm in the green and blue region for TPH and IPH series, respectively. The poly(amine−hydrazide) (I-IPH) derived from diacid 2 and IPH showed a blue photoluminescence at 457 nm with full-width at half-maximum (fwhm) of 85 nm and exhibited a 34% quantum yield in NMP solution. Blue electroluminescence characteristics were observed from the poly(amine−1,3,4-oxadiazole)s of III-IPH and III-TPH. Cyclic voltammograms of the poly(amine−hydrazide) films cast onto an indium−tin oxide (ITO)-coated glass substrate exhibited one oxidation redox couples (Eonset) at 1.11 V vs Ag/AgCl in dry acetonitrile solution, and revealed electrochromic characteristics with a color change from colorless to green at applied potentials switched between 0 and 1.6 V. The present study suggests that novel poly(amine−hydrazide)s and poly(amine−1,3,4-oxadiazole)s have a great potential as new blue-emitting materials with hole-transporting and electrochromic characteristics." @default.
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• W2093180597 date "2006-08-10" @default.
• W2093180597 modified "2023-09-29" @default.
• W2093180597 title "A New Class of High <i>T</i>_g and Organosoluble Aromatic Poly(amine−1,3,4-oxadiazole)s Containing Donor and Acceptor Moieties for Blue-Light-Emitting Materials" @default.
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• W2093180597 doi "https://doi.org/10.1021/ma060205d" @default.
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