PPE Microspore Dispersion for Low-Temperature Impregnation
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Solution Overview
Problem
Conventional processes for producing high-frequency copper clad laminates using low-molecular weight polyphenylene ether (PPE) resins require high-temperature impregnation, leading to increased costs and safety concerns, and result in non-homogeneous dispersions that negatively impact electrical and mechanical properties.
Innovation Solution
A process for preparing a PPE microspore dispersion by dissolving high-molecular weight PPE in a specific solvent, adding low-molecular weight PPE and processing aids, and using a second solvent to create microspores that wrap around the aids, allowing impregnation below 40°C without high-temperature equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-molecular weight PPE (HM-PPE) is used to improve electrical properties, then electrical properties are improved, but impregnation temperature must be higher than 40°C
Solution Approach 1:
The invention segments the PPE material into microspores (0.1-10 μm) with controlled morphology and distribution. By creating a dispersion system where HM-PPE microspores are uniformly distributed in the solvent, the material maintains its high electrical properties while the fine particle size enables low-temperature impregnation below 40°C.
Solution Approach 2:
The invention changes the physical state and size parameters of PPE from bulk resin to microspore dispersion. By controlling particle size, morphology, and distribution through specific processing methods, the material achieves both high electrical properties (from HM-PPE) and low processing temperature (from fine particle size and dispersion structure).
2Temperature
If HM-PPE is ground or crystalized into particles to enable room temperature impregnation, then impregnation temperature is reduced, but the dispersion becomes non-homogeneous
Solution Approach 1:
The invention creates local quality differences by forming microspores with specific morphological characteristics (size, shape, surface properties) that are uniformly distributed throughout the dispersion. This localized control of particle properties ensures homogeneous distribution while maintaining low impregnation temperature.
Solution Approach 2:
The invention uses a solvent as an intermediary medium to disperse HM-PPE microspores uniformly. The solvent facilitates homogeneous distribution of the microspores and processing aids, preventing aggregation and ensuring stable, homogeneous dispersion at room temperature impregnation conditions.
3Temperature
If low-molecular weight PPE (LR-PPE) is used to enable impregnation below 40°C, then impregnation temperature is reduced, but electrical properties deteriorate
Solution Approach 1:
The invention segments HM-PPE into microspore-sized particles, which reduces the impregnation temperature requirement while maintaining the high electrical properties of HM-PPE. The microspore structure allows low-temperature processing without sacrificing the electrical performance associated with high molecular weight PPE.
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 PPE microspore dispersion improves the homogeneity of HM-PPE and processing aids, enhancing the electrical and mechanical properties of high-frequency copper clad laminates, reducing production costs, and ensuring safer processing conditions.
Implementation Method 1
dissolving the HM-PPE in the first solvent at a temperature ranging between 45° C. and 110° C. to form a PPE-based dissolution liquid
Implementation Method 2
adding the second solvent into the PPE-based dissolution liquid under a weight ratio of the first solvent to the second solvent ranging between 0.10 and 2.0, to cause the PPE to wrap around the processing aids occurred constantly
Data Source
AI summary
A process for preparing PPE microspore dispersion includes steps of: dissolving a high-molecular polyphenylene ether in a first solvent at 45-110° C. to form a dissolution liquid; adding processing aids and well mixing the dissolution liquid into a dispersed phase; cooling the dissolution liquid to 42-80° C., and adding a second solvent to generate PPE microspores via PPE to wrap around the processing aids; cooling the dissolution liquid to 0-40° C. to obtain PPE microspore dispersions for use in application for impregnation processes performed below 40° C., thereby high-temperature impregnation equipment are no longer needed, and copper clad laminates made of using the PPE microspore dispersion enjoy excellent physical properties including high Tg, low Dk, low Df and high copper foil's peel strength.