- Novel triphenylamine polyamides bearing carbazole and aniline substituents for multi-colored electrochromic applications
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A novel carbazolyl-derived diamine containing triphenylamine, 4,4′-bis[(4-aminophenyl)amino]-4″-carbazolyltriphenylamine (VI), was prepared via the reduction of 4,4′-bis[(4-nitrophenyl)amino]-4″-carbazolyltriphenylamine. A series of novel polyamides (PAs,
- Liu, Yu,Liu, Tingjun,Pang, Lifei,Guo, Jinyu,Wang, Jiuyang,Qi, Duo,Li, Wenze,Shen, Kunzhi
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- Preparation of various morphological films at nanoscale by phase separation method
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A film consisting of nanopore and nanopillar structures was produced from a binary immiscible polymer solution of poly(amic acid) (PAA) and polyimide (PI), which can be used as a potential light extraction layer or flexible substrate in organic light-emit
- Gal, Yeong-Soon,Kim, Yong Hyun,Lim, Kwon Taek,Phan, Quoc Thang,Tu, Thi Kieu Trang
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p. 127 - 134
(2020/10/02)
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- Preparation and electrochromic properties of two series of polyurethanes containing separated triphenylamine moiety with different blocks
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Two series of novel aromatic polyurethanes containing triphenylamine derivatives were synthesized via polycondensation of 4-(3,6-diisocyanato-9H-carbazol-9-yl) aniline, N,N-bis(4-isocyanatophenyl) benzene-1,4-diamine with various dihydroxy monomers such as phenolphthalein, 2,2-bis (4-hydroxyphenyl) -propane, 4,4'-dihydroxybiphenyl, 4, 4'-bishydroxy benzophenone and bisphenolfluorene, respectively. The variation of the backbone structure affected the electronic properties, solubility, molecular weight and thermal stability of polyurethanes. The thermal stability of polyurethanes was studied by the gravimetric analyzer. The electrochromic performance was investigated by cyclic voltammograms and spectroelectrochemical methods, which showed stable and reversible electrochromic properties. Besides, the color of polyurethanes can be varied from initial colorless to green then to blue via electro-oxidation, which indicates the polyurethanes will have potential applications for eletrochromic materials. In addition, the PUs exhibited memory characteristic. The result indicated the PUs could be applied in smart window and memory devices.
- Ji, Yan,Zhang, Chunyu,Niu, Haijun,Zhao, Xiaofeng,Wang, Cheng,Qin, Chuanli,Wang, Wen,Bai, Xuduo
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p. 106 - 115
(2015/11/16)
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- Substituent effects on electrochemical and electrochromic properties of aromatic polyimides with 4-(carbazol-9-yl)triphenylamine moieties
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Three series of aromatic polyimides with 4-(carbazol-9-yl)triphenylamine moieties were prepared from the polycondensation reactions of 4,4′-diamino-4″-(carbazol-9-yl) triphenylamine (1), 4,4′-diamino-4″-(3,6-di-tert-butylcarbazol-9-yl)triphenylamine (t-Bu-1), and 4,4′-diamino-4″-(3,6-dimethoxycarbazol-9-yl) triphenylamine (MeO-1), respectively, with various commercially available tetracarboxylic dianhydrides. In addition to high thermal stability and good film-forming ability, the resulting polyimides exhibited an ambipolar electrochromic behavior. The polyimides based on t-Bu-1 and MeO-1 revealed higher redox-stability and enhanced electrochromic performance than the corresponding ones based on 1 because the active sites of their carbazole units are blocked with bulky t-butyl or electron-donating methoxy groups. 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1172-1184 Three series of 4-(carbazol-9-yl)triphenylamine-based aromatic polyimides are prepared by polycondensation of corresponding diamines with various commercially available tetracarboxylic dianhydrides. All the polyimides afford flexible and tough films with high thermal stability. The polymer films show ambipolar redox and multicolored electrochromic behaviors. During the electro-oxidation processes, the polyimides with t-butyl or methoxy substituents on the pendent carbazole unit exhibit enhanced electrochemical stability and electrochemical performance, as compared with the coresponding parent polyimides, because the electrochemically active sites of carbazole are blocked. Copyright
- Wang, Hui-Min,Hsiao, Sheng-Huei
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p. 1172 - 1184
(2014/03/21)
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- Volatile static random access memory behavior of an aromatic polyimide bearing carbazole-tethered triphenylamine moieties
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A functional polyimide (6F/CzTPA PI), 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA)/4,4′-diamino-4″-N- carbazolyltriphenylamine (DACzTPA), was synthesized in our present work for electrical resistive memory device applications. Semiconductor
- Shi, Lei,Tian, Guofeng,Ye, Hebo,Qi, Shengli,Wu, Dezhen
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p. 1150 - 1159
(2014/03/21)
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- New triphenylamine-based poly(amine-imide)s with carbazole-substituents for electrochromic applications
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A new carbazole-derived triphenylamine-containing diimide-diacid monomer (5), 4,4′-bis(trimellitimido)-4″-N-carbazolytriphenylamine, is prepared by the condensation of 4,4′-diamino-4″-N- carbazolytriphenylamine (4) and two molar equivalents of trimellitic
- Liu, Yu,Chao, Danming,Yao, Hongyan
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p. 1422 - 1431
(2014/05/20)
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- Novel high-Tg poly(amine-imide)s bearing pendent N-phenylcarbazole units: Synthesis and photophysical, electrochemical and electrochromic properties
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A new carbazole-derived, triphenylamine-containing aromatic diamine monomer, 4,4′-diamino-4″-N-carbazolyltriphenylamine, was successfully synthesized by the caesium fluoride-mediated condensation of N-(4-aminophenyl)carbazole with 4-fluoronitrobenzene, followed by palladium-catalyzed hydrazine reduction. A series of novel poly(amine-imide)s 6a-6g with pendent N-phenylcarbazole units having inherent viscosities of 0.17-0.56 dL g-1 were prepared from the newly synthesized diamine monomer and seven commercially available tetracarboxylic dianhydrides via a conventional two-step procedure that included a ring-opening polyaddition to give polyamic acids, followed by chemical or thermal cyclodehydration. The polymers of the series were amorphous and most of them could afford flexible, transparent, and tough films with good mechanical properties. All the poly(amine-imide)s had useful levels of thermal stability associated with high glass-transition temperatures (303-371 °C), 10% weight-loss temperatures in excess of 543 °C, and char yields at 800 °C in nitrogen higher than 60%. The poly(amine-imide)s 6e-6g exhibited a UV-vis absorption maximum at around 300 nm in NMP solution. The poly(amine-imide) 6g derived from an aliphatic dianhydride was optically transparent in the visible region and fluoresced violet-blue at 403 nm in NMP with 4.54% quantum yield higher than the wholly aromatic 6e and 6f. The hole-transporting and electrochromic properties were examined by electrochemical and spectroelectrochemical methods. Cyclic voltammograms of the poly(amine-imide) films on an indium-tin oxide (ITO)-coated glass substrate exhibited a reversible oxidation wave at 1.05 V and an additional irreversible oxidation wave at 1.39 V versus Ag/AgCl in acetonitrile solution. The polymer films revealed excellent stability of electrochromic characteristics, with a color change from neutral pale yellowish to green doped form at applied potentials ranging from 0.00 to 1.15 V. The Royal Society of Chemistry 2006.
- Liou, Guey-Sheng,Hsiao, Sheng-Huei,Chen, Hwei-Wen
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p. 1831 - 1842
(2007/10/03)
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