Composite Conductive Polymer Composition for Uniform Film Formation
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Solution Overview
Problem
Existing conductive polymer compositions face challenges in achieving sufficient solubility in solvents and forming self-supported, uniform films due to high planarity and stacking tendencies of π-conjugated polymers, which limits their application in dye-sensitized solar cells and antistatic films.
Innovation Solution
A composite conductive polymer composition is developed by doping π-conjugated polymers with a polymer compound obtained from specific monomers, including sulfonic acid and polar monomers, which provides steric hindrance and enhances solubility, allowing for uniform film formation and improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If doping is performed to enhance electric conductivity of π-conjugated polymer, then conductivity is improved, but solubility deteriorates due to enhanced planarity and π-conjugation affinity
Solution Approach 1:
The polymer chain is segmented by introducing side chains with bulky groups (tert-butyl, adamantyl, etc.) at regular intervals along the conjugated backbone. This segmentation prevents continuous π-π stacking while maintaining the conductive backbone structure, enabling both high conductivity and solubility
Solution Approach 2:
The invention creates a composite structure combining the rigid conjugated backbone (for conductivity) with flexible side chains containing bulky groups (for solubility). This composite architecture allows the polymer to achieve both electrical conductivity and processability in solution
2Reliability
If polymer chains are highly planar with extended π-conjugation, then conductivity is enhanced, but film uniformity deteriorates due to stacking and crystallization tendencies
Solution Approach 1:
Bulky side groups are introduced at regular intervals along the polymer chain to segment and separate the planar backbones, preventing excessive stacking and crystallization while maintaining sufficient planarity for high conductivity
Solution Approach 2:
The invention optimizes the balance between backbone planarity (for conductivity) and side chain bulkiness (for preventing stacking). By carefully selecting and positioning bulky groups, the polymer achieves optimal film-forming properties while maintaining high electrical conductivity
3Reliability
If conventional doping methods are used to achieve high conductivity, then conductivity reaches conductor level, but handling and processing become difficult due to insufficient solubility
Solution Approach 1:
The introduction of bulky side groups segments the polymer structure, preventing aggregation and improving solubility to the point where the highly conductive polymer can be handled and processed like conventional soluble polymers
Solution Approach 2:
The invention changes the physical state parameters of the polymer by introducing solubilizing side groups, transforming the material from an insoluble powder to a solution-processable polymer while maintaining conductor-level conductivity
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 composite conductive polymer composition stably dissolves in aromatic and ester-based solvents, enabling the formation of uniform, self-supported films with enhanced conductivity, suitable for use in dye-sensitized solar cells and antistatic films, with improved durability and stability.
Implementation Method 1
doping π-conjugated polymers with a polymer compound obtained from specific monomers, including sulfonic acid and polar monomers, which provides steric hindrance and enhances solubility
Implementation Method 2
chemical oxidative polymerization by use of an oxidizing agent to obtain the π-conjugated polymer (B) doped with the polymer compound (A)
Data Source
AI summary
The purpose is to provide a technique which enables various kinds of conductive polymer composition to be dissolved in an organic solvent and to be used to form a conductive membrane on a target portion easily. Provided is a composite conductive polymer composition, a method of manufacturing the same, and a solution obtained by dissolving the composition in an aromatic solvent, ester-based solvent or ketone-based solvent. The composition is obtained by doping a π-conjugated polymer (B) with a polymer compound (A), wherein the polymer compound (A) is obtained from (a-1) a monomer having a sulfonic acid group and a polymerizable vinyl group in an amount of 20 to 60 mol%, (a-2) a polar monomer having a hydrophilic group and a polymerizable vinyl group in an amount of 20 to 60 mol%, and (a-3) another polymerizable monomer in an amount of 20 to 60 mol%, and the π-conjugated polymer (B) is obtained from a monomer compound selected from the formulas (I) to (III) in the formula (I) to (III), at least one of R1 to R4 represent an alkoxy group of C1 to C10, and the other groups represent H, an alkyl group of C1 to C10, or an alkoxy group of C1 to C10; at least one of R5 and R6 represent an alkoxy group of C1 to C10, and the other group represents H, an alkyl group or an alkoxy group of C1 to C10, or R5 and R6 jointly represent an alkylenedioxy group of C1 to C8; and R7 represents H, an alkyl group of C1 to C6, or an aromatic ring group.