Conductive Polymer Material with Amphoteric Ion Compound
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Solution Overview
Problem
Conductive polymer solutions with sulfonic acid dopants are strongly acidic and prone to particle agglomeration over time, leading to issues like reduced conductivity, film roughness, and short device lifetimes in organic EL applications, due to high hydrophilicity and corrosiveness.
Innovation Solution
A conductive polymer material comprising a π-conjugated polymer, a dopant polymer with a sulfo group, and an amphoteric ion compound that neutralizes the acidity and suppresses particle agglomeration, improving stability, filterability, and film-formability, while maintaining conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polythiophene with PSS dopant is used to achieve high conductivity and water dispersibility, then conductivity and hydrophilicity are improved, but affinity to organic solvent and organic substrate deteriorates, making film formation on organic substrates difficult
Solution Approach 1:
The patent modifies the dopant polymer structure by introducing fluorinated aromatic groups and adjusting the sulfo group content to 1-10 mol%, changing the chemical parameters to achieve balanced hydrophilicity and organic substrate affinity simultaneously
Solution Approach 2:
The patent creates a composite dopant polymer combining fluorinated aromatic groups with sulfo groups, integrating both hydrophilic properties and organic solvent compatibility into a single material system
2Reliability
If polythiophene with PSS dopant is used to achieve high hydrophilicity and water dispersibility, then water dispersibility is improved, but water solubility and stability in organic medium deteriorate, causing particle agglomeration and film roughness
Solution Approach 1:
The patent optimizes the sulfo group content to 1-10 mol% and introduces fluorinated aromatic groups, changing the chemical composition parameters to achieve sufficient water dispersibility while preventing excessive hydrophilicity that causes agglomeration
3Reliability
If excess sulfo groups are present in PSS dopant to enhance water dispersibility, then dispersibility is improved, but acidity increases making the solution strongly acidic and corrosive
Solution Approach 1:
The patent precisely controls the sulfo group content to 1-10 mol% and introduces fluorinated aromatic groups that provide dispersibility with lower acidity, changing the chemical composition to reduce harmful acidity while maintaining dispersibility
4Reliability
If film thickness or solid concentration is increased to achieve required conductivity, then conductivity is improved, but transmittance of the film deteriorates
Solution Approach 1:
The patent optimizes the dopant polymer structure with fluorinated aromatic groups and controlled sulfo group content, changing the material properties to achieve higher conductivity at lower solid concentrations, thereby maintaining transmittance
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 a conductive film with enhanced stability, transparency, and durability, suppressing particle agglomeration and corrosiveness, and can be further improved in conductivity through light exposure after film formation.
Implementation Method 1
an amphoteric ion compound which interacts with a dopant polymer and neutralizes part of a sulfo group
Implementation Method 2
suppresses the agglomeration of particles with the passage of time
Implementation Method 3
the conductivity can be improved by irradiation with a light after the film formation
Data Source
AI summary
A conductive polymer material includes a π-conjugated polymer, dopant polymer which contains a repeating unit having a sulfo group and has a weight-average molecular weight in the range of 1,000 to 500,000, and amphoteric ion compound represented by the following general formula (1),wherein RC1 and RC2 independently represent a linear, branched, or cyclic alkyl group having 1 to 10 carbon atoms, a linear, branched, or cyclic alkoxy group having 1 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, an acyloxy group having 2 to 10 carbon atoms, an alkoxycarbonyl group having 2 to 10 carbon atoms, a hydroxyl group, a nitro group, a halogen atom; and “m” and “n” are each an integer of 0 to 4. A conductive polymer material with low acidity that suppresses the agglomeration of particles with overtime, with an excellent stability in a solution state can be provided.