Modified Fluoropolymers for High-Voltage Dielectric Applications
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Solution Overview
Problem
Dielectric polymers, such as polypropylene and polyethylene terephthalate, face significant losses in dielectric strength and have difficulty balancing high dielectric constants with charge/discharge efficiency and energy density, especially under varying electrical stress and environmental conditions.
Innovation Solution
Modified fluoropolymers are created by disrupting coherent polar domains through radical generation and reaction with specific reactants, incorporating non-fluorinated moieties like oxygen groups and aromatic chemical groups, which enhance charge/discharge efficiency and reduce dielectric loss without compromising energy density or voltage/frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dielectric polymers (PP, PET) are used to achieve high charge/discharge efficiency, then charge/discharge efficiency is improved, but dielectric constant remains relatively low
Solution Approach 1:
The patent creates a composite dielectric material by combining fluoropolymer base structure with grafted polar moieties (oxo, hydroxyl, alkoxy groups) and non-polar moieties (alkyl, aromatic groups). This composite structure at the molecular level allows simultaneous achievement of high dielectric constant from polar groups and high charge/discharge efficiency from the fluoropolymer backbone, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent applies local quality by introducing specific functional groups at specific locations on the polymer chain. The fluoropolymer backbone provides the base dielectric properties, while grafted polar moieties locally increase dielectric constant, and non-polar moieties locally maintain charge mobility. This spatial differentiation of functional groups allows optimization of both charge/discharge efficiency and dielectric constant simultaneously.
2Strength
If dielectric polymers are subjected to electrical stresses (AC or DC), then electrical field polarization occurs, but dielectric strength and insulating resistance suffer significant losses
Solution Approach 1:
The patent changes the chemical parameters of the dielectric material by introducing fluorinated moieties with specific electronegativity and bond strength characteristics. The C-F bonds provide high electrical strength and stability, while the fluorinated structure reduces polarizability under electrical stress. This parameter change in the molecular structure allows the material to maintain high dielectric strength and reduce energy loss under AC or DC electrical stresses.
3Quantity of substance
If high dielectric constant materials are used to increase energy density, then energy density is improved, but charge/discharge efficiency and dielectric loss are compromised
Solution Approach 1:
The patent segments the polymer structure into distinct functional domains: fluoropolymer backbone segments provide charge transport pathways for high charge/discharge efficiency, while grafted polar moiety segments provide high dielectric constant. This segmentation allows each segment to perform its specialized function without interfering with the other, enabling simultaneous optimization of energy density and charge/discharge efficiency.
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 modified fluoropolymers exhibit improved charge/discharge efficiency and lower dielectric loss while maintaining comparable dielectric strengths and constants to existing materials, suitable for high-voltage applications and varied environmental conditions.
Implementation Method 1
modifying the polymer backbone or moieties appended thereto via radical generation and reacting the radicals with various reactants
Implementation Method 2
reacting the radicals with various reactants to produce a fluoropolymer(s) having fluorinated moieties and/or non-fluorinated moieties
Data Source
AI summary
Modified fluoropolymers, and methods for manufacturing modified fluoropolymers are provided. According to at least one embodiment, chemically modified fluoropolymers, via radical generation and subsequent reaction, produce fluoropolymers having fluorinated moieties and/or non-fluorinated moieties, disrupting highly coherent polar domains, wherein the non-fluorinated moieties include, for example, at least one of carbonyl, hydroxyl, alkoxy, alkyl, and/or aromatic chemical groups.