Electroactive Polymer with Oligoanilines in the Main Chain: Synthesis, Characterization and Dielectric Properties

Abstract

An electroactive polymer with well‐defined oligoanilines in the main chain has been prepared by oxidative coupling polymerization. The detailed characteristics of the polymer were systematically studied by FT‐IR, 1H NMR, GPC and XRD. Its electrochemical behavior was explored with UV‐Vis spectra and cyclic voltammetry showing that its intrinsic electroactivity was maintained and exhibited three distinct reversible oxidative states. Its electrical conductivity is about 3.91 × 10−4 S · cm−1 in HCl‐doped form at room temperature. Furthermore, the polymer displays a dielectric constant of 48.4 and 13.6 at 10 and 1 MHz, respectively, mainly attributed to the improvement in delocalized charge density and electrical conductivity of the polymer by introduction of the conjugated oligoaniline segments.magnified image

Hyperbranched electroactive azo polyamide based on oligoaniline: Synthesis, characterization, and dielectric properties

“…34 It was noted that the dielectric constant showed a frequency dependence and the dielectric constant decreased signicantly with the increase of frequency, resulting from the AC-conductivity increasing with the frequency at a higher frequency 35,36 and the dipoles and charge carriers within the polymer failing to keep up with increasing AC frequency. 37 Furthermore, the hyperbranched polymer pre- sented higher dielectric constants compared with the similar linear polymer reported before, 18 probobaly because of the highly branched three-dimensional molecular architecture and the high content of the oligoaniline segments. Figure 6(b) showed the frequency dependence of dielectric loss in the experimental frequency range.…”

“…The polymer was synthesized through the reaction of monomer 2 and p-phenylenediamine by an oxidative coupling polymerization approach developed in our previous work, 16,18 which has been proved to be a convenient method to prepare a series of novel electroactive polymers with oligoaniline groups in the backbone under mild conditions. In the FTIR spectrum, the characteristic absorption bond around 3427 cm -1 was attributed to stretching vibrations of N-H.…”

“…[14][15][16][17] Nevertheless, to the best of our knowledge, the dielectric properties of such kinds of polymers haven't attracted enough attention. 18 In view of the fact that PANI has been utilized as a conductive filler to improve the dielectric constant of a polymer matrix successfully, 19,20 we have an optimistic view of obtaining high dielectric constant polymers by introducing oligoanilines to polymer chains via covalent bond, which could avoid the drawbacks of agglomeration and phase separation in PANI/insulating polymer blends prepared by physical mixing methods.…”

Polymer nanocomposite coatings

“…126 A novel route for oxidative coupling polymerization has been developed by Wei, Zhang and co-workers. [127][128][129][130][131] The fabricated copolymers not only contained well-defi ned conjugated segments, but also provided a better understanding of the structure-property relations and the conducting mechanism of conjugated polymers; knowledge which is limited by the complexity of their molecular structure and their poor solubility in organic solvents. Zagorska and co-workers 132,133 prepared new electroactive polymers combining the electrochromic properties of PTh and oligoaniline.…”

Novel electroactive aromatic polyamide with oligoanilines and azo groups in the backbone: synthesis, characterization and dielectric properties

“…4 UV-vis spectra of (a) emeraldine base of the polymer and (b) polymer doped with HCl segments [36]. Since PANI has been utilized as a conductive filler to improve the dielectric constant of a polymer matrix successfully [37][38][39], we had an optimistic view of obtaining high dielectric constant polymers by introducing oligoanilines into polymer chains.…”