Phosphinated PPO Oligomers for Flame Retardant PCB Resins
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Solution Overview
Problem
Poly(2,6-dimethyl phenylene oxide) (PPO) materials face limitations in achieving flame retardancy and high performance due to their flammability and difficulty in curing, which restricts their application in high-frequency printed circuit boards requiring UL-94 grade V-0 flammability and high thermal and electrical properties.
Innovation Solution
Introduction of a phosphorus group to PPO to produce phosphinated poly(2,6-dimethyl phenylene oxide) oligomers with unsaturated groups, such as styrenated PPO, which can be cured to form a thermoset with low dielectric constant and high glass transition temperature, enhancing flame retardancy and solubility for better glass fiber impregnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If PPO is used as a thermoplastic polymer, then it exhibits high-Tg, high tensile strength, and low dielectric constant, but it is flammable and cannot achieve UL-94 grade V-0 flammability
Solution Approach 1:
The patent introduces phosphorus-containing groups into the PPO molecular structure through chemical modification, changing the chemical composition parameters of the polymer. This phosphination process incorporates flame retardant elements (phosphorus) while maintaining the base PPO structure, thereby achieving UL-94 grade V-0 flammability without completely sacrificing the inherent high-Tg and low dielectric constant properties of PPO
Solution Approach 2:
The patent creates a composite material system by combining PPO with phosphorus-containing compounds (such as DOPO derivatives). This composite approach integrates the flame retardancy of phosphorus-containing materials with the high-Tg and low dielectric properties of PPO, achieving a material that simultaneously satisfies both flammability requirements and electrical performance specifications
2Ease of manufacture
If PPO is modified to enable self-curing through oxidative coupling, then it becomes a thermoset with improved flame retardancy, but it exhibits high viscosity and poor solubility
Solution Approach 1:
The patent controls the degree of phosphination and molecular weight of the modified PPO to optimize the balance between curing capability and processability. By adjusting the phosphorus content and oligomer chain length, the material achieves sufficient reactivity for crosslinking while maintaining adequate solubility in common solvents and low enough viscosity for glass fiber impregnation
Solution Approach 2:
The patent introduces pendant allyl groups through partial modification rather than complete transformation of the PPO structure. This partial action approach provides enough reactive groups for self-curing while preserving the majority of the original PPO structure, thereby maintaining good solubility and impregnation properties
3Strength
If high molecular weight PPO is used, then it exhibits high tensile strength and rigidity, but it shows high viscosity and poor solubility to glass fiber
Solution Approach 1:
The patent segments the high molecular weight PPO into lower molecular weight oligomers through controlled degradation or synthesis of oligomeric structures. This segmentation reduces the molecular weight to a range that provides adequate strength while dramatically improving solubility and impregnation capability, allowing the material to penetrate glass fibers effectively in PCB manufacturing
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 resulting thermoset exhibits improved flame retardancy, low dielectric constant, and high glass transition temperature, meeting the stringent requirements of high-frequency printed circuit boards while maintaining mechanical properties.
Implementation Method 1
The unsaturated group-containing phosphinated poly(2,6-dimethyl phenylene oxide) oligomer according to the present invention can be cured to produce a flame resistant thermoset
Implementation Method 2
an organophosphorus compound can impart a desired flame retardancy to a polymer
Data Source
AI summary
The present invention relates to a phosphinated poly(2,6-dimethy phenylene oxide)oligomer, specifically an unsaturated group-containing phosphinated poly(2,6-dimethy phenylene oxide)oligomer, and processes for producing the same. A thermoset produced from the unsaturated group-containing phosphinated poly(2,6-dimethy phenylene oxide)oligomers according to the present invention exhibits flame retardancy and has a low dielectric constant and dissipation factor and a high glass transition temperature.