PTFE Substrate Composition with Terminal Vinyl Groups
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Solution Overview
Problem
Current high-frequency substrate materials, such as PTFE, lack mechanical strength and are difficult to process, making it challenging to achieve a balance between low dielectric constant, low dielectric loss factor, and high mechanical strength for dense wiring in electronic products.
Innovation Solution
A substrate composition comprising 25-80 parts by weight of PTFE or PFA polymer, 20-75 parts by weight of inorganic filler, and 0.015-0.7 parts by weight of a compound with at least three terminal vinyl groups, which improves workability and mechanical strength without affecting dielectric properties, formed into a film layer through a curing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If PTFE is used as substrate material, then dielectric constant and dielectric loss factor are reduced, but mechanical strength and rigidity deteriorate
Solution Approach 1:
The patent applies composite materials by combining PTFE polymer with inorganic fillers (such as glass beads, glass flake, or glass fiber) to create a substrate material that maintains the low dielectric loss factor of PTFE while gaining the mechanical strength and rigidity from the inorganic components. This composite approach resolves the contradiction between energy loss reduction and strength improvement.
2Loss of energy
If PTFE is used as substrate material, then dielectric constant is reduced, but ease of manufacture deteriorates
Solution Approach 1:
By formulating a composite material system comprising PTFE, inorganic fillers, and specific additives (wetting agents, lubricants, release agents), the patent improves processability while maintaining low dielectric constant. The additives modify the composite's rheological and surface properties, enabling easier manufacturing operations such as molding and lamination.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the composition ratios, particle size distribution, and surface treatment of inorganic fillers within specific ranges. These parameter optimizations adjust the composite material's flow characteristics, curing behavior, and surface properties to enhance ease of manufacture while preserving the low dielectric constant property.
3Strength
If inorganic filler is added to PTFE, then mechanical strength is improved, but dielectric properties may deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the type, particle size, surface treatment, and concentration of inorganic fillers within specific ranges. By optimizing these parameters, the patent achieves improved mechanical strength while maintaining low dielectric loss factor, as the controlled filler characteristics minimize interference with the PTFE matrix's dielectric properties.
Solution Approach 2:
The patent employs local quality by applying surface treatments or coatings to specific regions of the inorganic fillers. This local modification of filler surface properties improves interfacial bonding with the PTFE matrix, enhancing mechanical strength without significantly affecting the overall dielectric loss factor of the composite material.
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 substrate composition achieves a low dielectric constant, low loss factor, and high mechanical strength, suitable for use in printed circuit boards and high-frequency applications, as demonstrated by increased elastic and viscosity moduli compared to compositions without the terminal vinyl group compound.
Implementation Method 1
a compound having at least three terminal vinyl groups... the film layer is a cured product formed from the substrate composition
Data Source
AI summary
A substrate composition and a substrate prepared from the substrate composition are provided. The substrate composition includes 25-80 parts by weight of a polymer, 20-75 parts by weight of an inorganic filler, and 0.015-0.7 parts by weight of a compound. The total weight of the polymer and the inorganic filler are 100 parts by weight. The polymer is selected from a group consisting of polytetrafluoroethylene (PTFE) and perfluoroalkoxy alkane (PFA). The compound has at least three terminal vinyl groups.