Variable Microwave Transmission Attenuation by Conducting Polymers

1992 ◽  
Vol 293 ◽  
Author(s):  
Martin W. Rupich ◽  
Ying Ping Liu ◽  
Alan B. Kon
Keyword(s):  
Conducting Polymers ◽  
Microwave Radiation ◽  
Polymer Films ◽  
Doping Level ◽  
Conductive Polymers ◽  
Microwave Properties ◽  
Counter Anion ◽  
Microwave Transmission ◽  
Transmission Attenuation ◽  
Potential Use

AbstractThe microwave properties of polypyrrole, polyaniline and poly(3-hydroquinonylpyrrole) films were examined as a function of doping level, conductivity, counter anion and thickness. The microwave transmittance of the polymer films was varied from less than 10% to greater than 90%; by oxidizing and reducing the polymers. The potential use of conductive polymers in the design of an electromagnetic modulator for the tunable attenuation of microwave radiation is described.

Influence of Structural Parameters of Conducting Polymers on their Microwave Properties

1993 ◽  
Vol 328 ◽  
Author(s):  
P. Hourquebie
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Conducting Polymers ◽  
Molar Mass ◽  
Alkyl Chain ◽  
Structural Parameters ◽  
Microwave Properties ◽  
Complex Dielectric Constant ◽  
Frequency Range ◽  
Counter Anion

ABSTRACTThe complex dielectric constant ε* (ε* = ε′-iε″) of conducting polymers (polyaniline and poly (3-alkyl thiophene)) is studied over a frequency range spanning from 130 MHz to 20 GHz. The effects of structural parameters (counter-anion size, Molar Mass, length of the alkyl chain on the substituted Monomer) on electrical properties (σdc and ε* values) have been investigated.

Electrochemical Synthesis of Conducting Polymers Involving Deep Eutectic Solvents

2020 ◽  
Vol 16 (4) ◽  
pp. 478-494 ◽  
Author(s):  
Florentina Golgovici ◽  
Liana Anicai ◽  
Andreea Florea ◽  
Teodor Visan
Keyword(s):  
Ionic Liquids ◽  
Conducting Polymers ◽  
Electrochemical Synthesis ◽  
Conductive Polymers ◽  
Electrochemical Polymerization ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Widespread Application ◽  
Eutectic Mixtures ◽  
New Findings

Background: Deep eutectic solvents (DESs) represent a new generation of ionic liquids which are widely promoted as “green solvents”. They are gaining widespread application in materials chemistry and electrochemistry. DESs are defined as eutectic mixtures of quaternary ammonium salt with a hydrogen bond donor in certain molar ratios. Their use as solvents for electrochemical synthesis of conducting polymers could influence the polymer properties and reduce their economic cost. Objective: This review presents the most recent results regarding the electropolymerization of common conductive polymers involving choline chloride based ionic liquids. New findings from our laboratory on the electrochemical growth of conductive polymers are also discussed. Methods: The electrochemical polymerization mechanisms during synthesis of polypyrrole (PPy), polyaniline (PANI) and poly(3,4-ethylenedioxythiophene) (PEDOT) using various formulations of DESs are reviewed, as well as their characteristics, mainly from surface morphology view point. Results: Some general information related to the preparation and characterization of DESs is also presented, followed by an overview of the recent advances in the field of electropolymerization using DESs. Conclusion: Electropolymerization of conducting polymers involving DESs represents an attractive route of synthesis due to their compositional flexibility which makes possible the preparation of unlimited formulations further influencing the polymer morphology and properties. The use of these inexpensive eutectic mixtures has a large potential to contribute to the development of more sustainable technological processes meeting many of the required features characteristic to the green chemistry.

Further understanding of the mechanisms of electrochromic devices with variable infrared emissivity based on polyaniline conducting polymers

2019 ◽  
Vol 7 (32) ◽  
pp. 9878-9891 ◽  
Author(s):  
Leipeng Zhang ◽  
Bo Wang ◽  
Xiaobai Li ◽  
Gaoping Xu ◽  
Shuliang Dou ◽  
...  
Keyword(s):  
Conducting Polymers ◽  
Thermal Management ◽  
Electrical Energy ◽  
Infrared Emissivity ◽  
Electrochromic Devices ◽  
Considerable Potential ◽  
Management Application ◽  
The Future ◽  
Potential Use

Adaptive infrared (IR) electrochromic devices driven by electrical energy have considerable potential use in intelligent IR thermal management application in the future.

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