Ionic Liquid Dielectric Polymer for Flexible Piezoelectrics
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Solution Overview
Problem
Current ferroelectric materials, particularly inorganic piezoceramics, face challenges such as lead toxicity, brittleness, high processing temperatures, and limited strain under electric fields, while ferroelectric polymers offer mechanical flexibility but have lower ferroelectric responses and require high electric fields and input voltage.
Innovation Solution
A dielectric polymeric composition comprising a polymeric matrix with structural units derived from polymerizable vinyl monomers, an ionic liquid with an organic cation and balancing anion, and a crosslinking agent, where the ionic liquid is miscible with the monomers, and the concentration ranges from 0.5 wt.% to 30 wt.%, enhancing ferroelectric properties through improved dispersion and reduced unreacted monomer content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic piezoceramics are used to achieve high ferroelectric response, then ferroelectric properties are improved, but weight increases, brittleness occurs, and processing becomes difficult and expensive
Solution Approach 1:
The patent changes the material composition parameters by incorporating ionic liquids into the polymer matrix at specific concentrations (5-30 wt%), which modifies the ferroelectric properties to achieve high response while maintaining the advantages of polymer materials such as light weight and flexibility
Solution Approach 2:
The patent creates a composite material system combining polymer matrix with ionic liquid additives, leveraging the benefits of both components: the mechanical flexibility and light weight of polymers, and the enhanced ferroelectric response from the ionic liquid incorporation
2Reliability
If inorganic piezoceramics are used to achieve high ferroelectric response, then ferroelectric properties are improved, but processing temperature increases above 500°C
Solution Approach 1:
The patent changes the processing temperature parameter by utilizing polymer-based materials that can be processed at low temperatures (below 100°C), eliminating the need for high-temperature sintering required by inorganic piezoceramics while maintaining ferroelectric functionality
3Ease of operation
If ferroelectric polymers are used to achieve mechanical flexibility, then ease of operation is improved, but ferroelectric response decreases and high electric field is required
Solution Approach 1:
The patent changes the material composition by incorporating ionic liquids into the polymer matrix, which enhances the ferroelectric response (polarization) of the polymer material, allowing it to achieve both mechanical flexibility and improved ferroelectric properties simultaneously
Solution Approach 2:
The patent creates a composite system combining polymer matrix with ionic liquid, where the ionic liquid component enhances the ferroelectric response while the polymer matrix maintains mechanical flexibility, achieving a balance between the two properties
4Reliability
If ionic liquids are used in polymer matrices to produce ferroelectric polymers, then ferroelectric properties are improved, but polarization loss increases
Solution Approach 1:
The patent optimizes the concentration parameter of ionic liquid in the polymer matrix, finding that specific ranges (5-30 wt%) provide enhanced ferroelectric properties while minimizing polarization loss, thus resolving the trade-off between improving ferroelectric response and reducing energy loss
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 dielectric polymeric composition exhibits enhanced ferroelectric properties with improved stability and reduced polarization loss, enabling flexible and efficient piezoelectric applications with lower voltage requirements.
Implementation Method 1
enhancing ferroelectric properties through improved dispersion and reduced unreacted monomer content
Data Source
AI summary
A dielectric polymeric composition comprising a polymeric matrix comprising structural units derived from a polymerizable vinyl monomer; an ionic liquid comprising an organic cation and a balancing anion, wherein the ionic liquid is miscible or partially miscible with the polymerizable vinyl monomer, and wherein the concentration of ionic liquid in dielectric polymeric composition ranges from 0.5 to 30 wt. %; and less than 10 ppm of unreacted polymerizable vinyl monomer, based on the total weight of the composition, wherein an amount of unreacted polymerizable vinyl monomer in the composition is measured via HPLC. The polymeric matrix further comprises structural units derived from a polymerizable co-monomer comprising a functional group that has the ability to form hydrogen bonds within the polymeric matrix. The polymeric matrix further comprises a crosslinking agent, and wherein the polymeric matrix comprises covalent crosslinks between the crosslinking agent and the structural units derived from the polymerizable vinyl monomer.