Crosslinked Polyamideimide Capacitor Dielectric for High Temperatures
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Solution Overview
Problem
Current polymer-based dielectric materials in capacitors lack temperature stability and high permittivity, particularly polyamideimides, which have not been utilized effectively for capacitor applications despite their potential due to limitations in existing technologies.
Innovation Solution
A capacitor design featuring a uniform dielectric layer composed of polyamideimide with a high content of polyamideimide, where the dielectric layer is free of additives and inorganic materials, and is chemically crosslinked to enhance temperature stability and permittivity, allowing for direct electrode contact and tailored properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional polymer-based dielectric materials like BOPP are used, then ease of manufacture is maintained, but temperature stability deteriorates (maximum service temperature of 105°C)
Solution Approach 1:
The patent applies parameter changes by chemically crosslinking the polyamideimide dielectric layer, transforming it from a thermoplastic to a thermosetting material. This crosslinking process fundamentally alters the material's thermal properties, enabling service temperatures up to 300°C while maintaining manufacturability through established crosslinking techniques
Solution Approach 2:
The patent employs composite materials by creating a crosslinked polyamideimide structure that combines the base polymer with crosslinking agents. This composite approach achieves superior temperature stability (up to 300°C) and enhanced mechanical properties while preserving ease of manufacture through conventional processing methods
2Reliability
If traditional dielectric materials are used, then device complexity is kept simple, but permittivity deteriorates (low permittivity in the range of 2.2 for BOPP)
Solution Approach 1:
The patent achieves high permittivity by modifying the chemical structure and crosslinking density of the polyamideimide dielectric layer. Through controlled crosslinking and material composition adjustments, the permittivity is enhanced to nearly twice that of BOPP while maintaining a simple single-layer capacitor structure without additional complex components
3Temperature
If polyamideimide is used as a uniform dielectric layer without additives, then temperature stability is improved (up to 300°C), but manufacturing precision requirements increase
Solution Approach 1:
The patent applies homogeneity by using a uniform polyamideimide dielectric layer without additives, fillers, or inorganic materials. This pure, homogeneous structure ensures consistent thermal and electrical properties throughout the dielectric layer, achieving temperature stability up to 300°C while simplifying manufacturing by eliminating the need for precise dispersion and distribution of multiple components
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 polyamideimide dielectric layer exhibits superior temperature stability up to 300°C and high permittivity, surpassing traditional materials like BOPP, enabling applications in high-temperature environments such as aerospace technology with improved mechanical and electronic properties.
Implementation Method 1
a polyamideimide-containing dielectric layer can exhibit high permittivity over a wide input frequency range
Data Source
AI summary
In an embodiment a capacitor includes a dielectric layer including a polyamideimide, the dielectric layer being uniform and a first electrode disposed directly adjacent to the dielectric layer.