Modified PPO Resin for Printed Circuit Boards
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Solution Overview
Problem
Current polyphenylene oxide (PPO) resins used in printed circuit boards face challenges such as high melting viscosity, poor solvent resistance, and difficulty in processing due to their thermoplastic nature, which affects their application in electronic components, particularly in terms of dielectric properties and solderability.
Innovation Solution
A modified PPO resin with a bismaleimide (BMI) and benzoxazine (BZ) resin blend, formulated with specific molecular weights and structural modifications, is developed to enhance its thermosetting properties, improving glass transition temperature, dielectric performance, and processing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PPO resin is used as printed circuit board material, then good mechanical property and dielectric property are achieved, but melting viscosity is too high to be processed and molded into shape
Solution Approach 1:
The patent uses a blended system combining thermoplastic PPO resin with thermosetting resin components (epoxy resin, polyimide resin, or phenolic resin). This composite approach allows the material to exhibit both the excellent dielectric and mechanical properties of PPO and the processability benefits of thermosetting resins, resolving the contradiction between high melting viscosity and ease of manufacture.
Solution Approach 2:
The patent modifies the resin composition by controlling the weight ratio of thermoplastic resin to thermosetting resin (specifically 70:30 to 90:10), and adjusts molecular weight parameters (Mw between 10,000-100,000, Mw/Mn between 1.05-2.0) to optimize both processability and final material strength, thereby resolving the viscosity-processing contradiction.
2Ease of manufacture
If crosslinkable reactive group is introduced into PPO resin molecular structure to make it thermosetting, then processing difficulty is reduced, but compatibility defects occur due to different polarity and chemical structures
Solution Approach 1:
The patent introduces a compatibilizer component (grafted polymer or block copolymer containing both PPO and thermosetting resin segments) that acts as an intermediary between the thermoplastic PPO resin and thermosetting resin. This compatibilizer improves interfacial adhesion and compatibility between the two resin systems, preventing the composition instability that would otherwise result from mixing resins with different polarities and chemical structures.
3Ease of manufacture
If blended thermoset composite is formed by incorporating other thermoset resins, then processing difficulty is reduced, but good characteristics of PPO resins are lost
Solution Approach 1:
The patent precisely controls the composition parameters by limiting thermosetting resin content to 10-30 wt% and thermoplastic resin to 70-90 wt%, and specifies molecular weight ranges (Mw: 10,000-100,000, Mw/Mn: 1.05-2.0) to maintain the excellent dielectric properties characteristic of PPO resins while incorporating enough thermosetting resin to improve processing ease.
Solution Approach 2:
The patent creates a optimized composite material system where the dominant PPO resin phase preserves the excellent dielectric properties, while the thermosetting resin phase (epoxy, polyimide, or phenolic) provides improved processing characteristics. The specific composition ratios ensure that the good characteristics of PPO are maintained while achieving easier processing.
4Strength
If PPO resin is used for printed circuit board, then good mechanical property is achieved, but poor solvent resistance leads to wires not firmly attached or falling off during cleaning
Solution Approach 1:
The patent combines PPO resin with thermosetting resins (epoxy, polyimide, or phenolic resin) in a blended system where the thermosetting component provides enhanced solvent resistance through crosslinked molecular structures, while the PPO phase maintains good mechanical properties. This composite approach resolves the contradiction between mechanical performance and solvent resistance.
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 modified PPO resin exhibits improved glass transition temperature, dielectric properties, low water absorption, and enhanced thermal conductivity, making it suitable for electronic component packaging and other applications like resin-coated copper and adhesives.
Implementation Method 1
a three-dimensional space solid structure is formed by molecular chain cross-linking
Implementation Method 2
soften or melt after heating and pressurizing and can flow and take shape after heating and pressurizing, and return to a solid state when cooled
Data Source
AI summary
A resin comprises at least one compound selected from one of the following formulas