Ceramic Titanate Thermoplastic Composition for High Dielectric Stability
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Solution Overview
Problem
Traditional ceramic-filled thermoplastics, such as polyphenylene oxide and polypropylene, exhibit limitations in heat resistance, melt flow, dimensional stability, and dielectric constant, restricting their use in high-performance applications due to a maximum dielectric constant of about 9.0, necessitating the development of materials with higher dielectric constants while maintaining mechanical and physical properties.
Innovation Solution
The use of ceramic titanate-filled polyether ketone (PEEK), polyphenylene sulfide (PPS), or polyphenylene oxide (PPO) compositions with ceramic fillers like CaTiO3, MgTiO3, and SrTiO3, which offer a dielectric constant greater than 4.0 and a dissipation factor less than 0.005 at 1.9 GHz, enhancing mechanical properties and dimensional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional ceramic-filled thermoplastics (polyphenylene oxide, polypropylene) are used, then the material is easy to process and manufacture, but the dielectric constant is limited to about 9.0 and heat resistance is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by replacing traditional fillers (titanium dioxide, barium sulfate) with ceramic titanates (barium titanate, strontium titanate, calcium titanate, magnesium titanate). This parameter change increases the dielectric constant from about 9.0 to greater than 4.0 while maintaining thermoplastic processability, directly resolving the contradiction between ease of manufacture and dielectric performance
Solution Approach 2:
The patent creates composite materials by combining thermoplastic resins (polyphenylene oxide, polypropylene, polystyrene) with ceramic titanate fillers. This composite approach allows the material to inherit the processing advantages of thermoplastics while gaining the high dielectric constant properties of ceramic titanates, simultaneously achieving ease of manufacture and improved dielectric reliability
2Reliability
If ceramic fillers are added to thermoplastics, then dielectric constant is improved, but heat resistance and dimensional stability deteriorate
Solution Approach 1:
The patent optimizes the particle size parameter of ceramic titanate fillers to range from 0.1 to 10 micrometers. This specific parameter range improves dielectric constant while minimizing the negative impact on dimensional stability and heat resistance, as smaller particles provide better dispersion and fewer defects that would compromise structural stability
Solution Approach 2:
The patent applies local quality by carefully selecting and distributing specific ceramic titanate types (barium titanate, strontium titanate, calcium titanate, magnesium titanate) within the thermoplastic matrix. This localized optimization ensures high dielectric constant in regions where it is needed while maintaining overall dimensional stability and heat resistance of the composite material
3Reliability
If ceramic filler particle size is reduced, then dielectric constant is improved, but manufacturing precision and material uniformity worsen
Solution Approach 1:
The patent optimizes the particle size parameter to a specific range of 0.1 to 10 micrometers, avoiding both coarse particles (which reduce dielectric constant) and ultra-fine particles (which cause aggregation and poor uniformity). This optimized parameter range achieves high dielectric constant while maintaining good material uniformity and manufacturing precision
Solution Approach 2:
The patent uses a moderate particle size range rather than pushing to the extreme of ultra-fine particles. This partial action approach provides sufficient dielectric constant improvement without over-refining to the point where manufacturing precision and material uniformity would deteriorate, achieving an optimal balance point
Data Source
AI summary
Disclosed is a composition comprising from about 15 wt. % to about 80 wt. % of a thermoplastic resin, wherein the thermoplastic resin comprises a polyphenylene sulfide or a polyether ketone or a combination thereof; and from about 10 wt. % to 80 wt. % of a ceramic filler, wherein the ceramic filler comprises (a) an oxide of titanium, barium, calcium, magnesium, or copper, or strontium or a combination thereof, or (b) a titanate of calcium, magnesium, titanium, or copper or a combination thereof, and wherein the ceramic filler has a particle size of from about 0.1 μm to about 10 μm, wherein the composition exhibits a dielectric constant greater than 4, wherein the composition exhibits a dissipation factor less than 0.005 at 1.9 GHz, and wherein the combined weight percent value of all components does not exceed 100 wt. %, and all weight percent values are based on the total weight of the composition.