Conductive Polymer Capacitors via Solubilizing Polymer Mediator
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Solution Overview
Problem
Current methods for producing π conjugated conductive polymers face challenges such as low conductivity, complex production processes, and poor compatibility with binder resins, leading to difficulties in forming uniform films and achieving high conductivity in capacitors and antistatic coatings.
Innovation Solution
A conductive composition comprising a π conjugated conductive polymer, a dopant, and a nitrogen-containing aromatic cyclic compound is used, which includes an organic sulfonic acid as a solubilizing polymer and a cross-linkable nitrogen-containing aromatic cyclic compound, enhancing conductivity and adhesion properties through a simple application process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical oxidative polymerization is used to produce π conjugated conductive polymer, then large amount of polymer can be produced in solution, but the polymer becomes insoluble solid powder as conjugated system grows
Solution Approach 1:
The patent introduces a solubilizing polymer as an intermediary substance that interacts with the π conjugated conductive polymer to maintain solubility. The solubilizing polymer has a structure that includes a main chain and side chains, where the side chains provide solubility while the main chain interacts with the conductive polymer, preventing aggregation and maintaining solution state during and after polymerization.
Solution Approach 2:
The patent creates a composite material system consisting of the π conjugated conductive polymer combined with the solubilizing polymer. This composite structure allows the conductive polymer to maintain its conductivity properties while the solubilizing polymer component provides solubility and processability, enabling the formation of uniform films.
2Ease of operation
If anion group-containing polymeric acid is added to improve dispersibility, then aqueous dispersion solution can be easily prepared, but large amount of compounds which do not contribute to conductivity are required
Solution Approach 1:
The patent modifies the molecular structure parameters of the solubilizing polymer, specifically designing the ratio and configuration of hydrophobic and hydrophilic segments. By optimizing these structural parameters, the polymer achieves effective solubilization at lower concentrations, reducing the amount of non-conductive material needed while maintaining good dispersibility.
3Manufacturing precision
If electrolytic polymerization is used to form film on base, then film of π conjugated conductive polymer can be formed on base surface, but mass production is very difficult
Solution Approach 1:
The patent replaces the electrolytic polymerization method (which requires electrical systems and complex equipment) with chemical oxidative polymerization. This substitution allows the reaction to proceed in solution without requiring electrical current, enabling simpler processing and mass production while still achieving high-quality film formation through the solubilizing polymer.
4Productivity
If high oxidative oxidants are used in chemical oxidative polymerization, then polymerization can proceed efficiently, but unfavorable side reactions occur in high probability
Solution Approach 1:
The patent employs the solubilizing polymer structure as a protective environment that cushions against the harsh effects of strong oxidants. The unique molecular architecture of the solubilizing polymer creates a microenvironment that allows efficient polymerization to proceed while minimizing side reactions and excessive oxidation, protecting the polymer structure quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in capacitors with high conductivity and low equivalent series resistance, as well as antistatic coatings with excellent conductivity, flexibility, and adhesion, suitable for various applications including optical filters and information recording media.
Implementation Method 1
a conductive composition comprising a π conjugated conductive polymer, a dopant, and a nitrogen-containing aromatic cyclic compound
Implementation Method 2
which includes an organic sulfonic acid as a solubilizing polymer
Implementation Method 3
a cross-linkable nitrogen-containing aromatic cyclic compound, enhancing conductivity and adhesion properties
Data Source
AI summary
A conductive composition comprises a π conjugated conductive polymer, a dopant, and a nitrogen-containing aromatic cyclic compound. A capacitor comprises an anode composed of a porous material of valve metal, a dielectric layer formed by oxidizing the surface of the anode, and a cathode provided on the dielectric layer and having a solid electrolyte layer containing a π conjugated conductive polymer, which comprises an electron donor compound containing an electron donor element provided between the dielectric layer and the cathode. Another capacitor is based on the above-described capacitor, wherein the solid electrolyte layer further comprises a dopant and a nitrogen-containing aromatic cyclic compound. An antistatic coating material comprises a π conjugated conductive polymer, a solubilising polymer containing an anion group and/or an electron attractive group, a nitrogen-containing aromatic cyclic compound, and a solvent. An antistatic coating is formed by applying the antistatic coating material.