PEDOT Composite Synthesis via Concomitant Polymerization
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Solution Overview
Problem
The existing methods for synthesizing Poly(3,4-ethylenedioxythiophene)-(co)-polymer-electrolyte composite require multiple steps and often involve the use of surfactants, which can be difficult to eliminate and result in instability of the final product.
Innovation Solution
A single-step concomitant synthesis process where Poly(3,4-ethylenedioxythiophene) and (co)-polymer-electrolyte are polymerized simultaneously using a water-soluble initiator, such as ammonium persulfate, in the presence of ionic and nonionic monomers, eliminating the need for additional additives and stabilizers, and allowing for the formation of a stable composite latex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple-step synthesis method is used to prepare PEDOT-(co)-polymer-electrolyte composite, then the polymer electrolyte can be added after PEDOT synthesis, but the process becomes complex and requires additional surfactants that are difficult to eliminate
Solution Approach 1:
The patent combines the synthesis of PEDOT and polymer electrolyte into a single simultaneous polymerization step, where both polymers are formed together in the presence of their respective monomers and a common initiator. This eliminates the need for separate synthesis steps and removes the requirement for surfactants that would otherwise be needed to stabilize the multi-component system.
Solution Approach 2:
The patent employs a water-soluble initiator that serves a dual function: it initiates polymerization of both the EDOT monomer (to form PEDOT) and the ionic monomer (to form polymer electrolyte). This universal initiator eliminates the need for separate initiators and surfactants, simplifying the overall process while maintaining control over both polymerization reactions.
2Reliability
If surfactants are used in PEDOT synthesis, then the polymerization can proceed, but the surfactants are difficult to eliminate and reduce product stability
Solution Approach 1:
The patent completely removes surfactants from the synthesis system by using a water-soluble initiator that can initiate polymerization without requiring surfactant stabilization. The ionic monomer itself provides the necessary charge and stability functions that would otherwise require separate surfactant additives, thereby eliminating the harmful factor of surfactant presence and the associated difficulty of removal.
3Stability of the object's composition
If (co)-polymer-electrolyte is added to pre-synthesized PEDOT, then the composite can be formed, but the stability is reduced compared to concomitant synthesis
Solution Approach 1:
The patent performs preliminary action by simultaneously forming both PEDOT and polymer electrolyte chains during the polymerization process, rather than adding pre-formed components. This concomitant formation ensures proper molecular-level mixing and interaction between the two polymer types, resulting in superior composite stability that cannot be achieved by simple physical mixing of pre-synthesized components.
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 method simplifies the synthesis process, enhances the stability of the PEDOT-(co)-polymer-electrolyte composite, and produces a water-soluble, transparent conductive film suitable for organic electronics applications, with improved stability and efficiency compared to traditional methods.
Implementation Method 1
Ammonium persulfate makes it possible to polymerize oxidatively EDOT to PEDOT and the precursor monomers of the (co)polymer electrolyte to (co)polymer electrolyte in a radical manner.
Implementation Method 2
The concomitant polymerization of EDOT and of the precursor monomers of the (co)polymer electrolyte is carried out in emulsion using a water-soluble initiator.
Data Source
Figure 1~3b
Figure 4
AI summary
The invention relates to a method for the synthesis of the composite Poly (3,4-ethylenedioxythiophene) – (co) - polymer electrolyte in a single step.