Conductive Polymer Composite with Crosslinked Siloxane Network
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Solution Overview
Problem
Conjugated polymers used in electronic devices face thermal instability and solvent sensitivity due to de-doping processes, leading to decreased conductivity and device degradation, as conventional doping methods require significant synthesis efforts and are not thermally stable.
Innovation Solution
A thermally stable and solvent-resistant conductive polymer composite is created by incorporating a crosslinked siloxane network into a doped host conjugated polymer, using crosslinkable silane precursors that form a crosslinked network and act as doping agents, enhancing electrical conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional doping methods are used to improve electrical conductivity of conjugated polymers, then conductivity is enhanced, but thermal stability deteriorates due to de-doping processes and dopant diffusion at elevated temperatures
Solution Approach 1:
The patent combines conjugated polymers with crosslinkable silane precursors to form a composite material system. The silane precursors undergo crosslinking to form a three-dimensional network structure that integrates with the conjugated polymer matrix, creating a composite that maintains electrical conductivity while providing thermal stability through the crosslinked framework that prevents polymer chain rearrangement and dopant diffusion.
Solution Approach 2:
The crosslinkable silane precursors are incorporated into the conjugated polymer system before thermal processing. The precursors are positioned within the polymer matrix in advance, and upon crosslinking, they form a preventive network structure that restrains subsequent thermal degradation, dopant diffusion, and polymer chain rearrangement before they can occur during elevated temperature exposure.
2Reliability
If doping is applied to enhance conductivity under various solvent environments, then electrical performance is improved, but solvent resistance deteriorates due to de-doping and morphological disorder
Solution Approach 1:
The patent creates a composite system where crosslinked siloxane networks are integrated with doped conjugated polymers. This composite structure provides a rigid framework that protects the doped polymer chains from solvent-induced morphological disorder and de-doping processes, thereby maintaining both electrical conductivity and solvent resistance simultaneously.
Solution Approach 2:
The crosslinked siloxane network is formed in advance within the conjugated polymer matrix to create a protective framework before solvent exposure. This pre-formed network structure prevents solvent molecules from disrupting the polymer-dopant complex and maintains morphological order during solvent environment exposure.
3Reliability
If molecular dopants are used to achieve stable doping under ambient conditions, then doping stability is improved, but thermal stability deteriorates due to dopant diffusion at high temperatures
Solution Approach 1:
The crosslinked siloxane network acts as an intermediary framework that physically confines the molecular dopants within the conjugated polymer matrix. The crosslinked structure serves as a barrier that prevents dopant diffusion at high temperatures while allowing the dopants to remain effectively associated with the polymer chains under ambient conditions, thereby maintaining both doping stability and thermal stability.
Solution Approach 2:
The patent creates a composite structure where crosslinked silane precursors form a network that integrates with the doped conjugated polymer. This composite framework provides physical confinement for the molecular dopants, preventing their diffusion at elevated temperatures while maintaining effective doping under ambient conditions.
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 exhibits improved thermal stability and solvent resistance, maintaining high conductivity and stability under elevated temperatures and in various solvent environments, with the crosslinked network preventing doped polymer chain rearrangement and dopant diffusion.
Implementation Method 1
at least three out of R1, R2, R3, R4, R5, and R6 are selected from a group including a chloride group, a bromine group, a hydroxyl group or an alkyloxyl groups which can form condensation reactions
Implementation Method 2
at least one out of R1, R2, R3, R4, R5, and R6 comprise a doping agent
Data Source
AI summary
A thermally stable and solvent resistant conductive polymer composite and its manufacturing friendly preparation method are disclosed. The disclosed composite presents great electrical conductivity with thermal stability and solvent resistance. A method of mixing a host conjugated polymer and a crosslinkable silane precursor simultaneously introduces both dopant and rigid cross-linked siloxane network into polymer system. The thin film made by the disclosed thermally stable and solvent resistant conductive polymer composite can be applied to fabricate various devices.