Star-Branched Copolymer Circuit Substrate Low Dielectric Loss
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Solution Overview
Problem
Existing materials for circuit substrates, such as epoxy resin and polyphenylene ether, fail to meet the requirements of high mechanical and electrical performance, particularly in terms of low dielectric loss and high temperature stability, for high-frequency signal transmission in electronic and automotive applications.
Innovation Solution
A star-branched copolymer composition is developed, comprising polymer arms with specific molecular weights and structures derived from vinyl aromatic monomers, high Tg monomers, and acyclic conjugated dienes, which are selectively hydrogenated to achieve improved mechanical and electrical properties, including a low dielectric constant and dissipation factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resin is used for circuit substrates, then mechanical strength is improved, but dielectric loss increases
Solution Approach 1:
The patent employs a composite material system combining PPO resin base polymer with specific curing agents (aminoplasts, carboxylated rubber, or metal carboxylates) to achieve both low dielectric loss and adequate mechanical strength. The composite formulation leverages the low dielectric properties of PPO while the curing agents provide crosslinking for mechanical reinforcement, resolving the contradiction between strength and dielectric performance.
Solution Approach 2:
The patent modifies the chemical composition parameters of the resin system by controlling the types and ratios of curing agents (aminoplasts, carboxylated rubber, metal carboxylates) to optimize both mechanical strength and dielectric loss properties. By adjusting these compositional parameters, the material achieves simultaneous improvement in both contradictory properties.
2Loss of energy
If polyphenylene ether resin is used to reduce dielectric loss, then dissipation factor is improved, but mechanical strength decreases
Solution Approach 1:
The patent creates a composite material system where PPO resin provides the low dissipation factor base, while added curing agents (aminoplasts, carboxylated rubber, metal carboxylates) provide mechanical reinforcement through crosslinking. This composite approach allows the material to simultaneously achieve low dissipation factor and adequate mechanical strength.
Solution Approach 2:
The patent adjusts the chemical composition parameters by selecting specific curing agents and controlling their ratios in the PPO resin system. This parameter optimization enables the material to achieve both low dissipation factor and improved mechanical strength, resolving the contradiction between these two properties.
3Loss of energy
If fluorinated polymers are used to reduce dielectric loss, then dissipation factor is improved, but processability and high temperature resistance worsen
Solution Approach 1:
The patent changes the chemical composition parameters by using PPO resin with specific curing agents instead of fluorinated polymers. This parameter substitution maintains low dissipation factor while dramatically improving processability and high-temperature resistance, as PPO-based systems are known to be more processable and thermally stable than fluorinated alternatives.
4Strength
If epoxy resin with phenolic compounds is used, then mechanical properties are improved, but dielectric loss remains high
Solution Approach 1:
The patent employs a composite material system where PPO resin serves as the base polymer providing low dielectric loss, combined with specific curing agents (aminoplasts, carboxylated rubber, metal carboxylates) for mechanical reinforcement. This composite approach achieves both good mechanical properties and low dielectric loss, overcoming the limitations of epoxy-phenolic systems.
Solution Approach 2:
The patent modifies the chemical composition parameters by replacing epoxy-phenolic formulations with PPO-based systems using specific curing agents. This parameter change maintains mechanical property enhancement while achieving significantly lower dielectric loss, resolving the contradiction between mechanical performance and dielectric properties.
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 star-branched copolymer composition exhibits enhanced mechanical strength, high temperature stability, and reduced dielectric loss, making it suitable for high-frequency applications in copper clad laminates and printed circuit boards with improved signal reliability and resistance to solvents.
Implementation Method 1
Each polymer arm comprises polymerized units (i), and optionally, polymerized units (ii), and optionally polymerized units (iii). The polymerized units (i) are derived from a first vinyl aromatic monomer containing a radical-reactive group, wherein from greater than 10 mol % to 100 mol % of the polymerized units are unhydrogenated.
Data Source
AI summary
A polymer composition comprising a star-branched copolymer having a plurality of arms is disclosed. Each polymer arm has a molecular weight Mp of from 1 kg/mol to 50 kg/mol and comprises polymerized units (i) derived from a first vinyl aromatic monomer comprising a radical-reactive group, wherein from greater than 10 mol % to 100 mol % of the units (i) are unhydrogenated; and optionally, polymerized units (ii) comprising hydrogenated and unhydrogenated forms of polymerized units derived from a high Tg monomer, and hydrogenated form of polymerized units (i) or hydrogenated form of polymerized styrene units; and optionally, polymerized units (iii) comprising (a) hydrogenated form of polymerized units derived from one or more acyclic conjugated dienes, and (b) polymerized units derived from one or more of a second vinyl aromatic monomer; wherein less than 10 wt. % of units (a) are unhydrogenated.