Phosphorous-Containing Poly Arylene Ether for Flame Retardant Laminates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional poly(arylene ether) resins used in laminated sheets for printed circuits face challenges such as high heat expansion coefficient, poor heat stability, insufficient flame retardancy, and the need for halogen-based flame retardants that are environmentally harmful, while also requiring improved mechanical properties and dielectric performance.
Innovation Solution
A novel phosphorous-containing functionalized poly(arylene ether) is developed, incorporating an organic phosphorous-based group to enhance flame retardancy, glass transition temperature, and heat resistance, which is synthesized through a method involving bisphenol compounds and DOPO (9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), allowing for a halogen-free, environmentally friendly thermosetting composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional poly(arylene ether) resins are used in laminated sheets, then the material provides good toughness and processability, but the heat expansion coefficient is high and heat stability is poor
Solution Approach 1:
The patent modifies the chemical structure of poly(arylene ether) by introducing phosphorous-containing functional groups at specific positions in the polymer chain. This chemical parameter change transforms the material from thermoplastic to thermosetting, achieving both improved heat stability through cross-linking and maintained processability through controlled curing kinetics
Solution Approach 2:
The invention creates a composite system by combining poly(arylene ether) backbone with phosphorous-containing functional groups (such as phosphonate ester groups). This composite molecular structure provides synergistic effects where the poly(arylene ether) framework maintains toughness and the phosphorous groups provide heat stability and flame retardancy
2Object-affected harmful factors
If halogen-based flame retardants are added to improve flame retardancy, then flame retardancy is enhanced, but environmental harm increases due to dioxin and benzofuran production
Solution Approach 1:
The patent converts the harmful effect of needing flame retardants into a beneficial feature by incorporating phosphorous-containing groups directly into the polymer structure. These groups provide inherent flame retardancy through phosphorous chemistry mechanisms that promote char formation and inhibit combustion, eliminating the need for separate halogenated flame retardant additives and their associated environmental hazards
Solution Approach 2:
The invention changes the chemical composition parameter by replacing halogen atoms with phosphorous atoms in the flame retardant function. This substitution maintains effective flame retardancy through phosphorous-mediated char formation and radical scavenging mechanisms while eliminating the toxic byproducts (dioxins, benzofurans) associated with halogen combustion
3Ease of manufacture
If low molecular weight poly(arylene ether) is used to improve processability, then viscosity is reduced, but the number of active groups decreases and cross-linking activity is low
Solution Approach 1:
The patent changes the molecular weight parameter to an optimal range (500-10,000 g/mol) that balances processability and cross-linking activity. Simultaneously, it modifies the chemical structure by introducing phosphorous-containing functional groups that serve as both cross-linking sites and flame retardant centers, ensuring sufficient active groups even at lower molecular weights
Solution Approach 2:
The phosphorous-containing functional groups serve multiple functions simultaneously: they act as cross-linking agents, provide flame retardancy, and maintain polymer chain flexibility. This multi-functionality allows the use of lower molecular weight polymers while preserving adequate cross-linking activity and overall material performance
4Productivity
If poly(arylene ether) is modified with unsaturated double bonds to increase reactivity, then cross-linking rate improves, but flame retardancy becomes insufficient requiring halogen additives
Solution Approach 1:
The patent changes the functional group parameter from unsaturated double bonds to phosphorous-containing groups (such as phosphonate esters). These phosphorous groups provide both high reactivity for cross-linking and inherent flame retardancy through phosphorous chemistry, eliminating the need for separate flame retardant additives while maintaining fast curing rates
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 phosphorous-containing poly(arylene ether) achieves excellent heat resistance, low water absorption, and improved dielectric properties, enabling the production of lightweight, high-performance electronic materials with enhanced flame retardancy and reduced environmental impact.
Implementation Method 1
the composition presents excellent low dielectric constant and dielectric loss, high heat resistance and flame retardancy
Implementation Method 2
incorporating an organic phosphorous-based group to enhance flame retardancy, glass transition temperature, and heat resistance
Implementation Method 3
enhance flame retardancy, glass transition temperature, and heat resistance
Data Source
AI summary
A structure of phosphorous-containing functionalized poly(arylene ether), a preparation method thereof, and a composition prepared therefrom are provided. The curable (cross-linkable) composition includes an unsaturated monomer and a phosphorous-containing functionalized poly(arylene ether) having a polymerizable group and a molecular weight between 500 and 20,000. The composition provides excellent fluidity and fast curing rate. After curing, the composition exhibits excellent low dielectric coefficient and dielectric loss, high heat resistance and flame retardancy. It is suitable for prepregs, laminated sheets for printed circuits or the like.