- Preparation and characterization, stable bismaleimide-triarylamine polymers with reversible electrochromic properties
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A series of novel polyimides were synthesized from bismaleimide containing different diaminetriarylamines by Michael addition reaction. The prepolymer is readily soluble in many common organic solvents, such as CHCl3, Tetrahydrofuran (THF) and N, N-dimethyl formamide (DMF). Prepolymers can be solution-cast into transparent, tough, and flexible films. These aromatic polyimides display good thermal stabilities, i.e. 5% weight-loss temperatures in excess of 200 C under nitrogen. All obtained polyimides revealed excellent stability of electrochromic characteristics, changing color from original yellowish to green. The energies of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of the investigated the polymers were estimated by experimental method are in the range of -4.78 eV to -4.98 eV and -1.64 eV to -2.09 eV vs the vacuum level, respectively. All the polymer films reveal good electrochemical and electrochromic stability under repeatedly switching electrode voltages, with coloration change from the yellow neutral state to green oxidized state.
- Zhang, Haiyang,Niu, Haijun,Ji, Yan,Wu, Wenjun,Cai, Jiwei,Wang, Cheng,Lian, Yongfu,Bai, Xuduo,Wang, Wen
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- Diacetylene-Based C 2h-Symmetric Monomers for Two-Dimensional-Polymer Synthesis
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Two linear monomers with two terminal photoreactive groups (anthracene or maleimide) embedded in a diacetylene skeleton were synthesized for two-dimensional-polymer synthesis. Both of them were crystallized and their single-crystal structures were solved. It was found that the size of terminal groups can be critical for diacetylene's arrangement. The crystal structure of dimaleimide monomer revealed that maleimide groups strongly stacking in antiparallel and the photo-induced [2+2] cycloaddition of stacked maleimides was preliminary studied.
- Song, Mengyao,Ma, Hanbing,Ren, Minghan,Ai, Zhaoquan,Li, Ming
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- Curing of oligomers with thermoreactive norbornene, chalcone, and maleimide groups
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Curing of powdered chalcone-containing oligoimides with terminal maleimide or norbornenedicarboxylic acid imide groups was studied by differential scanning calorimetry. The calorimetric characteristics of curing were discussed in relation to the chemical
- Sidorovich,Prasolova,Lavrent'ev,Nosova,Solovskaya,Kudryavtsev
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- Radical-mediated dehydrative preparation of cyclic imides using (NH4)2S2O8-DMSO: Application to the synthesis of vernakalant
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Ammonium persulfate-dimethyl sulfoxide (APS-DMSO) has been developed as an efficient and new dehydrating reagent for a convenient one-pot process for the synthesis of miscellaneous cyclic imides in high yields starting from readily available primary amines and cyclic anhydrides. A plausible radical mechanism involving DMSO has been proposed. The application of this facile one-pot imide forming process has been demonstrated for a practical synthesis of vernakalant.
- Garad, Dnyaneshwar N.,Tanpure, Subhash D.,Mhaske, Santosh B.
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supporting information
p. 1008 - 1016
(2015/08/18)
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- Synthesis, UV-Vis spectra, and Hammett correlation of some novel bis(dihydropyrrolo[3,4-c]pyrazoles)
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Twenty-nine novel bis(dihydropyrrolo[3,4-c]pyrazole) derivatives were obtained by reacting C, N-phenyl-substituted nitrilimines generated in situ from corresponding hydrazonyl chlorides with bismaleimides. The structures were elucidated by physical and spectroscopic methods [m.p., Rf, infrared (IR),1H nuclear magnetic resonance (NMR), 13C NMR, correlation spectroscopy (COSY), heteronuclear correlation (HETCOR), nuclear Overhauser effect (NOE), and high-resolution mass spectrometry (HRMS)]. Also, Hammett correlation graphs were obtained between Hammett constants σp and λmax values of bis(pyrrolopyrazoles) carrying p-substituted phenyl-ring-bearing electron-withdrawing and electrondonating groups and discussed in terms of substituent effects. Springer-Verlag 2010.
- Dueruest, Yasar,Yildirm, Muhammet
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scheme or table
p. 961 - 973
(2011/10/04)
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- New polymers with alkylidenesuccinimide structures based on bismaleimides and biscitraconimides
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New polymers containing alkylidenesuccinimide structures prepared from phosphorous ylides of bismaleimides or biscitraconimides and aromatic dialdehydes by the Witting reaction, are reported for the first time in the literature. Phosphorous ylides of bismaleimides or biscitraconimides were synthesized in situ by the reaction of bismaleimide or biscitraconimide or AB monomers containing both maleimide and aldehyde or citraconimide and aldehyde groups with triphenylphosphine in metha-cresol or acetic acid. The structures of monomers and polymers were confirmed by FTIR, 1H-NMR and UV-visible spectroscopy and elemental analysis. The thermal behaviour of polymers was studied by thermogravimetric analysis and differential calorimetric measurements.
- Gaina, Viorica,Gaina, Constantin
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experimental part
p. 647 - 652
(2011/10/18)
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- Synthesis of stereospecific hinged ladder polyimides by Diels-Alder reaction
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A one-stage synthesis of hinge-ladder polyimides by Diels-Alder poly-condensation of polychlorinated cyclic bisimidodienes with bismaleimides containing aromatic and aliphatic groups was studied.
- Salakhov,Umaeva,Alikhanova
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experimental part
p. 323 - 327
(2009/06/06)
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- Functional maleimide-based structural polymers
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Two reactive imide type polymers, polymaleimides and addition polyimides have been prepared. Polymaleimides based on N-(4-carboxy-phenyl)maleimide have been synthesized by free radical polymerization, thus resulting the corresponding homopolymer, a linear copolymer with N-vinyl-2-pyrrolidone, and a cross-linked (co)polymer in reaction with trimethylolpropane trimethacrylate. Addition polyimides based on N, N'-4, 4'-diphenylether- bismaleimide have been obtained by Michael polyaddition of 5-amino-salicylic acid and 5, 5-methylene-bissalicylic acid to the bismaleimide double bond. The chemical structures were identified by IR, and 10H-NMR spectroscopy. The calculated Q1 and e1 parameters for N-(4-carboxy-phenyl) maleimide in copolymerization with N-vinyl-2-pyrrolidone are of 0.035 and 1.013, respectively. The resulting bead-like (co)polymers have porous structures and a diameter in the range of 0.1-1.0 mm. Addition polyimides present inherent viscosities in the 0.28-0.37 dL/g range, and decomposition temperatures above 290 °C.
- Hulubei, Camelia
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experimental part
p. 743 - 752
(2009/12/24)
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- Synthesis of new bis(tetrahydropyrrolo[3,4-b]carbazoles) with a functionalized diaryl spacer
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Some new bis(tetrahydropyrrolo[3,4-b]carbazoles) were synthesized by Diels-Alder reactions of in-situ generated indole-2,3-quinodimethanes with a variety of bismaleimides as dienophiles and also by reaction of dianilines with a succinic acid anhydride group incorporated into a biscarbazole. In a special reaction a spermine linker was introduced. The new biscarbazoles represent potential DNA ligands for the development of new antitumor active drugs.
- Mehrabani,Pindur
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p. 1406 - 1412
(2007/10/03)
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- Synthesis and characterization of new polymaleamides from N,N'-biphenyletherbimaleimide with some diamines
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A new monomer, N,N'-biphenyletherbimaleimide (BPEBMI) has been synthesized by reaction between maleic anhydride and 4,4'-diaminobiphenyl ether in chloroform.Polymaleamides and copolymaleamides have been synthesized by ring opening polyaddition (ROPA) of BPEBMI to diamines (1,4-diaminobutane, 1,8-diaminooctane, piperazine and 2,5-dimethylpiperazine) in m-cresol.A model compound has also been synthesized.The polymers have been characterized on the basis of elemental analyses, solubility in various solvents, inherent viscosity and IR data.The thermal behaviour has been studied by TG.
- Rajeswari, N.,Deen, G. Roshan,Viswanathan, S.
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p. 1170 - 1174
(2007/10/02)
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