title: Preparation and characterization, stable bismaleimide-triarylamine polymers with reversible electrochromic properties.
abstract: 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.
authors: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Department of Macromolecular Material and Engineering, School of Chemistry and Chemical Engineering, Heilongjiang University, Harbin 150086, PR China.
authors: Haiyang
authors: H
authors: Zhang
authors: Haijun
authors: H
authors: Niu
authors: Yan
authors: Y
authors: Ji
authors: Wenjun
authors: W
authors: Wu
authors: Jiwei
authors: J
authors: Cai
authors: Cheng
authors: C
authors: Wang
authors: Yongfu
authors: Y
authors: Lian
authors: Xuduo
authors: X
authors: Bai
authors: Wen
authors: W
authors: Wang
mesh_terms: D000042:Absorption; D004159:Diphenylamine / Q000031:analogs & derivatives* / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods*; D008301:Maleimides / Q000737:chemistry*; D008956:Models, Chemical; D055620:Optical Phenomena; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D011789:Quantum Theory; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D008301:Maleimides; D011108:Polymers; D004159:Diphenylamine