Poly(arylene ether) Copolymer Purification via Chelation
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Solution Overview
Problem
Conventional methods for synthesizing poly(arylene ether) resins with low intrinsic viscosity and high functionality are not suitable, as they result in the formation of dispersions during purification, making it difficult to separate the resin from the polymerization catalyst, and do not effectively enrich the resin with low molecular weight chains.
Innovation Solution
A poly(arylene ether) copolymer is produced through oxidative copolymerization of monohydric and dihydric phenols in an aromatic hydrocarbon solvent with a catalyst containing a metal ion and nitrogen-containing ligand, followed by contacting the solution with a chelating agent to extract the metal ion, maintaining a specific molar ratio to avoid dispersion formation and achieve the desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional synthesis methods are used to produce low intrinsic viscosity poly(arylene ether) resins with high functionality, then the resin can achieve the desired low viscosity and high functionality, but dispersion forms during purification making it difficult to separate the resin from the polymerization catalyst
Solution Approach 1:
The patent changes the chemical parameters of the purification process by introducing a chelating agent that forms water-soluble complexes with metal catalysts. This parameter change allows selective extraction of the catalyst from the organic resin solution without forming dispersions, enabling clean separation while maintaining the resin's low intrinsic viscosity and high functionality.
Solution Approach 2:
The chelating agent acts as an intermediary substance that mediates between the organic resin solution and the metal catalyst. It selectively binds to the metal catalyst ions, forming water-soluble complexes that can be extracted from the organic phase, thus facilitating separation without direct contact between the resin and catalyst that would cause dispersion formation.
2Ease of manufacture
If conventional synthesis methods are used, then the purification process can be simplified, but the resin does not effectively enrich with low molecular weight chains
Solution Approach 1:
The patent utilizes the parameter change in the purification process (using chelating agent extraction) to simultaneously achieve both simplified purification and effective enrichment of low molecular weight chains. The selective extraction based on chemical affinity allows the resin fraction to be enriched in lower molecular weight species while maintaining an easy-to-implement purification process.
3Reliability
If aqueous solution of chelating agent is used to extract metal ion, then the resin can be separated from catalyst, but dispersion forms making separation difficult
Solution Approach 1:
The chelating agent serves as an intermediary that selectively interacts with the metal catalyst ions, forming water-soluble complexes. This intermediary approach enables reliable catalyst removal while avoiding direct aggressive interaction between the resin and catalyst that would cause dispersion formation, thus maintaining ease of separation.
Solution Approach 2:
The patent changes the chemical parameters of the extraction system by using chelating agents with specific affinity for metal ions. This parameter change allows selective extraction of the catalyst while maintaining the resin in the organic phase, achieving both reliable catalyst removal and easy separation without dispersion formation.
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 method successfully produces poly(arylene ether) copolymers with intrinsic viscosities of 0.04 to 0.15 deciliter per gram and 1.8 to 2 hydroxyl groups per molecule, enriched in low molecular weight chains, which are suitable for electronic materials, while avoiding dispersion issues during purification.
Implementation Method 1
contacting the polyfunctional poly(arylene ether) solution with an aqueous solution of a chelating agent to extract the metal ion from the solution
Implementation Method 2
oxidative copolymerization of monomers comprising a monohydric phenol and a dihydric phenol
Data Source
Figure 1
AI summary
A poly(arylene ether) copolymer is the product of oxidative copolymerization of monomers including a monohydric phenol and a dihydric phenol. It has an intrinsic viscosity of about 0.04 to about 0.15 deciliter per gram and, on average, about 1.8 to about 2 hydroxyl groups per molecule. The poly(arylene ether) copolymer is enriched in low molecular weight copolymer chains and copolymer chains that include a terminal unit derived from the dihydric phenol.