Synthesis of novel poly(amic acid) and polyimide with oligoaniline in the main chain and their thermal, electrochemical, and dielectric properties

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• 作者：Danming Chao ; Junfeng Zhang ; Xincai Liu ; Xiaofeng Lu ; Ce Wang ; Wanjin Zhang ; Yen Wei
• 关键词：Electroactive ; Oligoaniline ; Thermal properties
• 刊名：Polymer
• 出版年：2010
• 出版时间：17 September 2010
• 年：2010
• 卷：51
• 期：20
• 页码：4518-4524
• 全文大小：440 K

文摘

Electroactive poly(amic acid), with oligoaniline in the main chain, was synthesized from macro-monomer of oligoaniline and p-phenylenediamine by oxidative coupling polymerization. The polymer characterization included Fourier-transform infrared spectra (FTIR), ¹H nuclear magnetic resonance spectra (¹H NMR) and gel permeation chromatography (GPC) as a determination of polymer structure, spectral analysis of different oxidation states via UV–visible spectra. Then the obtained poly(amic acid) was heated at 260 °C to induce cyclization, and transformed into polyimide materials. X-ray powder diffraction (XRD) and thermogravimetric analysis (TGA) were used for the characterization of poly(amic acid) and polyimide materials. Moreover, poly(amic acid) and polyimide were tested in 1.0 M H₂SO₄ aqueous solution by cyclic voltammetry and they showed different electrochemical activity from each other. The prepared poly(amic acid) and polyimide doped with HCl exhibit a large enhancement in the dielectric constant in comparison to that of traditional polymers, ascribed to the improvement in charge delocalization of the polymers by introduction of the conjugated oligoaniline segments.