Crosslinked Polymer Dielectrics for High-Temperature Capacitors
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Solution Overview
Problem
Current polymer dielectrics used in capacitors face challenges in achieving high temperature stability and adjustable dielectric properties, particularly at temperatures above 150°C, and require precise control over crosslinking to balance mechanical strength and dielectric performance.
Innovation Solution
A method involving polymer chains with reactive groups that form covalent bonds with linker molecules, allowing for controlled crosslinking to achieve high temperature stability and adjustable dielectric constants, utilizing a two-component system to precisely adjust the degree of crosslinking and enhance moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polymer dielectrics are used for high temperature applications above 150°C, then temperature stability is improved, but dielectric properties become difficult to adjust precisely
Solution Approach 1:
The invention divides the dielectric material into two functional segments: a polymer matrix providing temperature stability and crosslinkable functional groups enabling precise dielectric property adjustment through controlled crosslinking. This segmentation allows each component to independently contribute its specialized function while working together as an integrated system.
Solution Approach 2:
The invention creates a composite dielectric material combining a polymer matrix with crosslinking agents and functional groups. This composite structure integrates the high temperature stability of the polymer backbone with the tunable dielectric properties achieved through controlled crosslinking density and functional group distribution, resolving the contradiction between thermal performance and property adjustability.
2Strength
If crosslinking is increased to improve mechanical strength, then mechanical integrity is improved, but dielectric performance may deteriorate
Solution Approach 1:
The invention enables precise control of crosslinking parameters including crosslinking density, crosslinking agent type, and functional group distribution. By adjusting these parameters within optimized ranges, the material achieves simultaneous improvement in mechanical strength and dielectric performance, transforming the trade-off relationship into a synergistic one where both properties enhance together.
Solution Approach 2:
The invention introduces crosslinking functionality at specific locations within the polymer chains through strategically placed functional groups. This localized crosslinking approach ensures that crosslinks are distributed optimally to provide mechanical reinforcement without creating excessive crosslink density that would compromise dielectric properties, achieving both mechanical strength and dielectric reliability.
3Object-affected harmful factors
If crosslinking is performed to enhance moisture resistance, then moisture resistance is improved, but processing flexibility may be reduced
Solution Approach 1:
The invention incorporates crosslinkable functional groups into the polymer chains during the polymerization stage, before the final crosslinking step. This preliminary action allows the polymer to be processed in its uncrosslinked or partially crosslinked state, maintaining processing flexibility, and then crosslinked subsequently to achieve the desired moisture resistance, thereby resolving the contradiction between ease of manufacture and moisture protection.
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 method enables the production of polymer dielectrics with high temperature stability above 150°C and adjustable dielectric properties, including dielectric constants of 3.0 or higher, while maintaining mechanical integrity and moisture resistance.
Implementation Method 1
The reactive groups are suitable for forming a covalent bond with a linker molecule
Implementation Method 2
crosslinking is carried out between the polymer chains or in a polymer chain by reaction or covalent bonding of a linker molecule with two reactive groups
Data Source
AI summary
The application relates to the process for producing a dielectric for a capacitor, the process for producing a capacitor and a capacitor. The process comprises the production of polymer chains from monomers by polymerization. In this process, some repeating units in the polymer chain are functionalized with reactive groups. The reactive groups branch off from the respective polymer chains. Furthermore, the reactive groups are suitable for reacting with a linker molecule. The reactive groups are therefore suitable for forming a covalent bond with a linker molecule. As a further process step, linker molecules are added to the polymer chains, each linker molecule having at least two chemical linking points, each of which is suitable for forming a covalent bond with a reactive group. Finally, crosslinking of the polymer chains is achieved by reactions of the linker molecules with two reactive groups.