VDF-TrFE Polymer End Groups for High Breakdown Voltage
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Solution Overview
Problem
Vinylidene fluoride copolymers used in electronics lack sufficient breakdown voltage and adhesive strength to substrates, particularly metal substrates, while maintaining piezoelectric, ferroelectric, pyroelectric, and dielectric properties required for high power electronics and microelectronics applications.
Innovation Solution
A fluoropolymer comprising recurring units from vinylidene fluoride, 10-50% trifluoroethylene, and 0.01-10% (meth)acrylic monomers, with specific structures and manufacturing processes, including aqueous emulsion polymerization, to enhance breakdown voltage, adhesive strength, and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vinylidene fluoride copolymers are used to maintain piezoelectric, ferroelectric, pyroelectric, and dielectric properties, then electrical functionality is preserved, but breakdown voltage and adhesive strength are insufficient
Solution Approach 1:
The patent introduces a composite polymer structure combining vinylidene fluoride-trifluoroethylene copolymer with specific end groups (—CF2H and/or —CF2CH3) in controlled amounts. This composite approach maintains the inherent piezoelectric, ferroelectric, pyroelectric, and dielectric properties of the VDF-TrFE copolymer while the specific end groups enhance both breakdown voltage and adhesive strength to metal substrates, resolving the contradiction between electrical performance and mechanical adhesion
Solution Approach 2:
The patent modifies the polymer structure by controlling the content of specific end groups (—CF2H and/or —CF2CH3) within defined ranges (e.g., 10-50 mmol/kg of vinylidene fluoride units). This parameter change optimizes both breakdown voltage and adhesive strength while preserving the ferroelectric and piezoelectric properties, allowing simultaneous improvement of multiple performance characteristics
2Reliability
If polymer composition is optimized for piezoelectric and dielectric properties, then electrical performance is improved, but adhesive strength to substrates deteriorates
Solution Approach 1:
The patent applies local quality modification by introducing specific end groups (—CF2H and/or —CF2CH3) at the polymer chain ends rather than throughout the bulk structure. This localized modification preserves the bulk piezoelectric and dielectric properties while the end groups provide enhanced adhesion to substrates, particularly metal surfaces, through specific chemical interactions
3Reliability
If polymer is designed for high power electronics applications, then electrical performance requirements are met, but thermal stability is insufficient
Solution Approach 1:
The patent creates a composite polymer system where the VDF-TrFE copolymer matrix provides piezoelectric and dielectric properties for high power electronics, while the incorporated end groups (—CF2H and/or —CF2CH3) contribute enhanced thermal stability. This composite structure allows the material to withstand the thermal conditions of high power electronics applications while maintaining required electrical performance
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 exhibits improved breakdown voltage, thermal stability, and adhesive strength to metal substrates, retaining excellent piezoelectric, ferroelectric, pyroelectric, and dielectric properties, making it suitable for high power electronics and microelectronics applications.
Implementation Method 1
the term piezoelectric means the ability of a material to exchange electrical for mechanical energy and vice versa and the electromechanical response is believed to be essentially associated with dimensional changes during deformation or pressure oscillation
Implementation Method 2
Ferroelectricity is the property of a material whereby this latter exhibits a spontaneous electric polarization, the direction of which can be switched between equivalent states by the application of an external electric field
Implementation Method 3
Pyroelectricity is the ability of certain materials to generate an electrical potential upon heating or cooling. Actually, as a result of this change in temperature, positive and negative charges move to opposite ends through migration (i.e. the material becomes polarized) and hence an electrical potential is established
Data Source
AI summary
The present invention pertains to a fluoropolymer [polymer (F)] comprising:recurring units derived from vinylidene fluoride (VDF);from 10% to 50% by moles of recurring units derived from trifluoroethylene (TrFE); andfrom 0.01% to 10% by moles of recurring units derived from at least one (meth)acrylic monomer [monomer (MA)] having formula (I) here below:wherein:R1, R2 and R3, equal to or different from each other, are independently selected from a hydrogen atom and a C1-C3 hydrocarbon group, andROH represents a hydrogen atom or a C1-C5 hydrocarbon moiety comprising at least one hydroxyl group.The invention also pertains to a process for the manufacture of said polymer (F) and to use of said polymer (F) as ferroelectric, piezoelectric, pyroelectric or dielectric material in electrical and electronic devices.