High-Dielectric Hydrophobic Polymer for Low-Voltage Electrowetting
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Solution Overview
Problem
Existing high molecular materials used in electrowetting technology, such as PDMS and Teflon AF, have low dielectric constants and high driving voltages, leading to limitations in application, while inorganic-organic nanocomposites face issues with dispersion, roughness, and decreased light transmittance.
Innovation Solution
A high-dielectric hydrophobic polymer is synthesized by introducing polar groups during polymerization, maintaining hydrophobicity and enhancing dielectric constant, with a cross-linked amorphous network structure to ensure low roughness and high light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high molecular materials such as PDMS and Teflon AF are used as dielectric layers, then hydrophobicity is maintained, but dielectric constant is low and driving voltage is high
Solution Approach 1:
The patent introduces polar groups (such as carbonyl, cyano, or nitro groups) into the polymer chain structure of the dielectric layer material, creating a composite structure that combines the hydrophobic backbone with polar side groups. This composite approach enables simultaneous achievement of high dielectric constant (improved polarizability) and maintained hydrophobicity, resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies local quality modification by introducing polar groups at specific locations within the polymer structure (side chains or specific positions along the backbone) while maintaining the overall hydrophobic character of the material. This localized introduction of polarity allows the material to exhibit high dielectric constant in specific regions while preserving bulk hydrophobicity.
2Quantity of substance
If inorganic nanoparticles are doped into high molecular material to improve dielectric constant, then dielectric property is enhanced, but film roughness increases and light transmittance decreases
Solution Approach 1:
The patent extracts the inorganic nanoparticle component from the composite system and replaces it with organic polar groups directly incorporated into the polymer structure. This elimination of nanoparticle doping while maintaining dielectric enhancement through molecular design resolves the roughness and transmittance issues associated with particulate fillers.
Solution Approach 2:
The patent changes the fundamental approach from physical mixing of nanoparticles to chemical incorporation of polar groups into the polymer matrix. This parameter change from particulate to molecular scale modification eliminates surface roughness issues while maintaining dielectric constant enhancement through increased polarizability of the polymer chains.
3Quantity of substance
If inorganic nanoparticles are doped into high molecular material to improve dielectric constant, then dielectric property is enhanced, but light transmittance decreases
Solution Approach 1:
The patent removes inorganic nanoparticle dopants from the system and replaces them with organic polar groups integrated into the polymer structure. This extraction of particulate matter eliminates light scattering centers while maintaining dielectric enhancement through molecular polarity, thereby preserving high light transmittance.
Solution Approach 2:
The patent transitions from a particulate-based dielectric enhancement mechanism to a molecular-based mechanism. This parameter change from macroscopic nanoparticle dispersion to microscopic molecular structure modification eliminates optical scattering while maintaining dielectric constant, thus preserving light transmittance.
4Quantity of substance
If polar groups are introduced into polymer to increase dielectric constant, then dielectric property is enhanced, but hydrophobicity is reduced
Solution Approach 1:
The patent introduces polar groups at localized positions within the polymer structure (such as side chains or specific segments of the backbone) rather than uniformly throughout the entire molecule. This localized polarity enhancement increases dielectric constant while the majority of the polymer structure retains its hydrophobic character, maintaining overall water repellency.
Solution Approach 2:
The patent creates a composite molecular structure combining hydrophobic backbone segments with polar side groups or functional moieties. This molecular-level composite structure allows simultaneous exhibition of high dielectric constant (from polar groups) and maintained hydrophobicity (from the dominant hydrophobic framework).
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 polymer achieves a dielectric constant twice that of conventional materials, with low hysteresis and recoverable electrowetting contact angles at low voltages, and maintains high light transmittance suitable for electrowetting displays and liquid lenses.
Implementation Method 1
By introducing the polar group into the polymer, the degree of dipole polarization of the polymer is able to be enhanced, which in turn increase the dielectric constant of the polymer
Implementation Method 2
The main principle of the electrowetting technology is to change a contact angle of a liquid-solid phase by varying a voltage applied to the hydrophobic dielectric layer, which in turn causes the deformation of the droplet
Data Source
AI summary
The present disclosure relates to the technical field of high molecular materials, discloses a high-dielectric hydrophobic polymer, a preparation method and use thereof, and relates to a polymer of formula I. The polymer of the disclosure has a polarizable group that is capable of increasing its dielectric constant while maintaining its high hydrophobicity, light transmittance and low roughness, so as to achieve a low hysteresis and recoverable electrowetting contact angle at a low voltage. The polymer of the present disclosure, as a cross-linked amorphous network polymer, has an extremely low crystallinity, and a good optical transparency with the light transmittance reaching 99%, which is sufficient to meet the requirements of an electrowetting display, a liquid lens and the like on the light transmittance.