Polyimide Fiber Resin Composite for Low-Loss High-Frequency Strength
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Solution Overview
Problem
There is a demand for resin molded articles with low dielectric constant and dielectric loss tangent to reduce transmission loss and heat generation in high-frequency electronic components, while also requiring high strength and lightweight materials.
Innovation Solution
A fiber-reinforced resin molded body composed of polyimide fibers and a resin, with specific properties optimized for low dielectric constant and loss tangent, high tensile strength, and lightweight characteristics, using a combination of aromatic tetracarboxylic dianhydride and aromatic diamine in the polyimide fiber formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional insulating materials are used in high-frequency applications, then the dielectric constant and dielectric loss tangent increase, but transmission loss and heat generation worsen
Solution Approach 1:
The invention uses a composite material system consisting of polyimide fibers embedded in a fluororesin matrix. The polyimide fibers provide structural reinforcement and contribute to low dielectric properties, while the fluororesin matrix provides excellent dielectric characteristics with low loss tangent. This composite structure achieves both mechanical strength and superior high-frequency electrical performance, resolving the contradiction between energy loss and transmission reliability.
Solution Approach 2:
The invention optimizes specific parameters of the composite material: the polyimide fiber content is controlled at 1-10 wt% to balance mechanical reinforcement with dielectric performance. The fluororesin matrix is selected for its inherently low dielectric loss tangent. By precisely controlling these material parameters and their proportions, the composite achieves minimal transmission loss while maintaining high signal transmission reliability at frequencies of 5 GHz and above.
2Strength
If fiber-reinforced materials are used to increase strength, then mechanical strength improves, but dielectric properties may deteriorate
Solution Approach 1:
The invention employs a carefully designed composite where polyimide fibers (providing high tensile strength) are dispersed in a fluororesin matrix (providing low dielectric loss). The fiber content is optimized at 1-10 wt%, which is sufficient to enhance mechanical properties while remaining low enough to preserve excellent dielectric characteristics. This composite approach simultaneously achieves both improved strength and maintained low dielectric loss.
Solution Approach 2:
The polyimide fibers are distributed throughout the fluororesin matrix to provide localized reinforcement where mechanical strength is needed, while the bulk fluororesin matrix maintains the low dielectric loss property. This spatial distribution of different material qualities allows the composite to exhibit both high strength and low dielectric loss simultaneously.
Data Source
AI summary
An object of the present invention is to provide a fiber-reinforced resin molded body having excellent dielectric properties, a light weight, and a high strength. A fiber-reinforced resin molded body according to the present invention includes a polyimide fiber and a resin. The dielectric constant of the fiber-reinforced resin molded body is 4.0 or less at frequencies in the frequency of 5 GHz or more and 80 GHz or less, and the dielectric loss tangent thereof is 0.02 or less at the same frequency. The tensile strength of the fiber-reinforced resin molded body is preferably in the range of 0.5 GPa or more and 2.5 GPa or less, and the tensile modulus of elasticity is preferably in the range of 25 GPa or more and 120 GPa or less.