Conductive Polymer Complex for Antistatic Coatings
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Solution Overview
Problem
Current methods for producing conductive polymers face challenges such as low solvent solubility, heat stability, and high electric conductivity, particularly in forming antistatic coatings for films and capacitors, where existing techniques result in insufficiencies like humidity-dependent conductivity and complex, costly processes.
Innovation Solution
A conductive composition comprising a π conjugated conductive polymer, a polyanion dopant, and a crosslinking site forming compound, such as those with glycidyl or hydroxyl groups, is used to create a complex that enhances conductivity, solubility, and heat stability, allowing for the formation of high-performance antistatic coatings and capacitors with improved adhesion and film formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical oxidative polymerization method is used to produce conductive polymer, then large quantity can be obtained in solution, but solubility for solvents decreases with polymer growth resulting in insoluble solid powder
Solution Approach 1:
The patent introduces functional groups (such as carboxyl, hydroxyl, or amine groups) at specific positions on the polymer chain of the conductive polymer. This chemical modification changes the physical and chemical parameters of the polymer, enabling it to form soluble derivatives while maintaining conductivity. The functional groups enable solubility in common solvents without sacrificing the conductive properties.
Solution Approach 2:
The patent creates composite structures by combining the conductive polymer with functional group-containing compounds or binder resins. This composite approach allows the conductive polymer to maintain its conductive core while the functional groups or binder resin provide solubility and processability, resolving the contradiction between conductivity and solubility.
2Stability of the object's composition
If solubilization is made by inducing functional group into conductive polymer, then solvent solubility is improved, but high electric conductivity and heat stability become difficult to ensure
Solution Approach 1:
The patent strategically places functional groups at specific local positions (such as side chains or terminal positions) rather than throughout the entire polymer structure. This localized modification maintains the core conductive polymer structure's integrity and conductivity while providing solubility only where needed, thus resolving the contradiction between solubility and conductivity.
Solution Approach 2:
The patent carefully controls the type, quantity, and position of functional groups introduced to achieve optimal balance. By adjusting these parameters, the patent maintains high electric conductivity while ensuring adequate solvent solubility and heat stability, transforming the trade-off into an optimized multi-parameter solution.
3Shape
If electrolytic polymerization method is used, then conductive polymer film is formed on electrode, but monomer is polymerized on electrode making large quantity production difficult and film has low solvent solubility
Solution Approach 1:
The patent inverts the conventional approach by first synthesizing the conductive polymer with functional groups in solution phase to achieve high quantity production and solubility, then subsequently forming films or coating on substrates. This reversal of the process sequence enables both large-scale production and good film formation properties.
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 achieves high electric conductivity, flexibility, and adhesion to bases, enabling the production of antistatic coatings and capacitors with low equivalent series resistance and improved stability, while simplifying the manufacturing process and reducing costs.
Implementation Method 1
a π conjugated conductive polymer and a dopant composed of a polyanion which forms a complex with the π conjugated conductive polymer
Implementation Method 2
at least one crosslinking site forming compound which reacts with a functional group to form a crosslinking structure
Implementation Method 3
applying it to the base surface, and polymerizing the monomer to form a complex of a vinyl chloride copolymer and a conductive polymer
Data Source
AI summary
A conductive composition comprises a π conjugated conductive polymer, a dopant composed of polyanion, and at least one crosslinking site forming compound selected from (a) compounds having a glycidyl group and (b) compounds having a hydroxyl group and one selected from the group consisting of allyl, vinyl ether, methacryl, acryl methacrylamide, and acrylamide groups. An antistatic coating material comprises a π conjugated conductive polymer, polyanion, at least one crosslinking site forming compound selected form the above (a) and (b), and a solvent. An antistatic coating is formed by applying the above-mentioned antistatic coating material. In a capacitor comprising an anode composed of a valve metal porous body; a dielectric layer formed by oxidizing the suds of the anode; and a cathode formed on the dielectric layer, the cathode has a solid electrolyte layer formed by crosslinking complexes of a π conjugated conductive polymer and a dopant composed of a polyanion.