Polyaniline/Graphene Oxide Composite Synthesis via Oligomer Dispersion
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Solution Overview
Problem
Existing methods for producing polyaniline/reduced graphene oxide composites are limited by the use of toxic aniline as a starting monomer, leading to unstable solutions, slow reaction kinetics, and the formation of low regularity polymers, which restricts their application in flexible electronics and inkjet printing.
Innovation Solution
A method involving the use of aniline oligomers, such as the dimer N-phenyl-1,4-phenylenediamine, dispersed in an acid aqueous solution with an emulsifying agent, which facilitates the formation of stable polyaniline/reduced graphene oxide composites by reducing branching and enabling faster reaction times, allowing for modulation of conductivity and improved solubility for inkjet printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aniline monomer is used as starting material for polyaniline synthesis, then polymerization can proceed via autocatalytic mechanism, but the resulting polymer has low regularity and forms unstable solutions
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing aniline oligomers (dimers, trimers, tetramers) before the main polymerization process. This pre-organization of monomeric units into controlled oligomeric structures enables subsequent polymerization to proceed with higher regularity and produces polymers that form stable solutions, directly resolving the contradiction between polymer regularity and solution stability.
2Productivity
If chemical polymerization of aniline is conducted using conventional methods, then polymer can be formed, but reaction kinetics are slow requiring 24 hours or more
Solution Approach 1:
The patent applies parameter changes by modifying the polymerization conditions: conducting the reaction at elevated temperatures (60-80°C) and using oligomeric starting materials instead of monomeric aniline. These parameter changes accelerate the reaction kinetics significantly, reducing polymerization time from 24+ hours to just 1-2 hours while maintaining high polymer quality.
3Ease of manufacture
If graphene oxide is used as oxidant and template for polyaniline formation, then composite can be formed, but graphene does not remain in solution and requires centrifugation for separation
Solution Approach 1:
The patent applies parameter changes by conducting polymerization at controlled temperatures (60-80°C) and using oligomeric aniline starting materials. These changes enable the formation of stable polymer solutions that remain soluble, eliminating the need for centrifugation and simplifying the overall manufacturing process while maintaining ease of composite formation.
4Ease of manufacture
If toxic aniline monomer is used for polyaniline synthesis, then polymer can be produced, but the process has high toxicity concerns
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing aniline oligomers under controlled conditions before the main polymerization process. This approach allows for better control over the reaction pathway and reduces the amount of toxic monomeric aniline needed, thereby reducing overall toxicity while maintaining ease of polymer production.
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
This approach results in highly regular polyaniline chains, stable solutions in organic solvents, and enhanced conductivity, enabling efficient use in flexible electronics and inkjet printing applications with reduced toxicity and faster reaction completion within one hour at 80°C.
Implementation Method 1
GO is a strong oxidant and can therefore be used as such in the synthesis of polyaniline, according to Reaction (5)
Implementation Method 2
reduction of graphene oxide (GO) in situ simultaneous with polymerisation in situ of the aniline
Implementation Method 3
dispersing the graphene oxide in an acid aqueous solution containing an emulsifying agent to obtain a dispersion of graphene oxide
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a method for obtaining composites of polyaniline and reduced graphene oxide comprising the steps of dispersing the graphene oxide in an acid aqueous solution containing an anionic emulsifying agent to obtain a dispersion of the graphene oxide; dissolving an aniline oligomer in an organic solvent to obtain a solution of the oligomer; mixing the solution of the oligomer with the dispersion of graphene oxide to obtain a composite of polyaniline and reduced graphene oxide. A use of the composite is also described.