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Synthesis and Study on Anilineand Electron -deficient Aromatic Ring Alternating Copolymer by Metal Complexes Catalyzed Method

Author: ZaiLaFu·WuBuAiShan
Tutor: SiMaYi·NuErLa；TuNiShaGuLi·AWuTi
School: Xinjiang University
Course: Chemistry
Keywords: organometallic polycondensation p-benzoquinonediimine electronic-deficient aromatic ring dibromobenzene alternating copolymers
CLC: O634
Type: Master's thesis
Year: 2011
Downloads: 29
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Abstract


Among the conducting polymers, polyaniline widely used in battery electrodes and capacitor materials due to its excellent environmental stability, low cost, ease in preparation. It has been an interesting research field that to improve electrical conductivity, electrochemical properties and to broaden the application area of polyaniline because of its hard process forming.The modification ways of polyaniline are substituent modification, copolymerization and complex modification. At present, through electrochemical polymerization and chemical oxidative polymerization can not gain alternating copolymers. In recent years, our group studied the aniline and electron-rich aromatic ring of alternating copolymers using the nickel complex catalyzed synthesis method. To further investigate the usage of this method, this paper peprared the p-benzoquinonediimine and electronic-deficient aromatic ring ofpyridine, pyridazine and pyrimidine alternating copolymers by the metal organic Ni (II) catalyzed synthesis method. And peprared the containing meta-position structured polyaniline in order to investigate the link parts impact on its properities.The fourier transform infrared (FTIR) spectra, 1HNMR , ultraviolet-visible (UV-vis) absorption spectra, cyclic voltammetry(CV), galvanostatic charge–discharge measurements, X-ray diffraction (XRD) and TGA were used to characterize the molecular structure and properties of copolymers. Specific findings are as follows:1. The alternating copolymers of p-benzoquinonediimine and pyridine were synthesised by metal organic Ni (II) catalyzed method. The copolymers had broad UV-vis absorption peaks at about 410~490nm, and their order of magnitude of molecular weight are 104. In comparision to poly(2,5-dimethyl-N,N′-p-benzoquinonediimine-co-pyridine) alternating copolymer, the poly(N,N′-p-benzoquinonediimine-co-pyridine) reveals better thermal stability and electrochemical property.2. The alternating copolymers of p-benzoquinonediimine and pyridazine were synthesised by metal organic Ni (II) catalyzed method. The copolymers had broad UV-vis absorption peaks at about 390~510nm and better thermal stability, and their order of magnitude of molecular weight are 2×104.3. The alternating copolymers of p-benzoquinonediimine and pyrimidine were synthesised by metal organic Ni (II) catalyzed method. The copolymers had broad UV-vis absorption peaks at about 380~450nm, and their UV-vis absorption peaks in CF3COOH red shifted 110 nm, implying the copolymers can be doped protonic acid in CF3COOH.4. The different ratio of 1,3 - dibromobenzene and 1,4 - dibromobenzene and p-benzoquinone copolymers were synthesised by metal organic Ni (II) catalyzed method. The results showed that the copolymer with 15% 1,3– dibromobenzene has better electrochemical property , thermal stability and crystallinity.Comparing to the oxidative polymerization, the metal organic Ni (II) catalyzed method can control the link modes of polymer. Such polymers doped with Iodine have good electrochemical activities.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Elements of the organic polymer
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