Oligomeric Phthalonitrile Synthesis and Low-Temperature Curing
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Solution Overview
Problem
The synthesis of oligomeric phthalonitriles typically requires high temperatures above 250°C for polymerization, limiting processability and increasing costs due to the use of reactive and costly monomers like fluorobenzophenone, and existing polymers face storage and curing challenges.
Innovation Solution
A method involving the reaction of bisphenol with chlorobenzophenone in the presence of an alkaline hydroxide base and a copper complex to form oligomeric aromatic ether-aromatic ketone phthalonitriles, allowing for partial curing below 250°C using metal salts and strong acids, enabling the formation of shaped solids at lower temperatures and improving thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature polymerization above 250°C is used to synthesize oligomeric phthalonitriles, then polymerization reaction proceeds effectively, but processability is limited and manufacturing costs increase
Solution Approach 1:
The patent modifies the chemical structure parameters of the monomer by introducing oligomeric aromatic ether-aromatic ketone units with terminal phthalonitrile groups. This structural parameter change reduces the polymerization temperature from above 250°C to lower temperatures, improving processability while maintaining reaction effectiveness
Solution Approach 2:
The patent creates composite monomer structures combining aromatic ether-aromatic ketone oligomers with terminal phthalonitrile groups. This composite approach integrates the beneficial properties of both structural components, enabling lower temperature curing and improved manufacturing characteristics
2Reliability
If reactive and costly monomers like fluorobenzophenone are used to synthesize phthalonitriles, then polymerization reactivity is improved, but manufacturing costs increase
Solution Approach 1:
The patent replaces expensive fluorobenzophenone monomers with more cost-effective oligomeric aromatic ether-aromatic ketone precursors that contain terminal phthalonitrile groups. This substitution maintains adequate polymerization reactivity while significantly reducing raw material costs
Solution Approach 2:
The patent introduces oligomeric aromatic ether-aromatic ketone structures as intermediary precursors that contain terminal phthalonitrile groups. These intermediates serve as cost-effective alternatives to expensive fluorinated monomers while providing the necessary reactivity for polymerization
3Stability of the object's composition
If phthalonitrile monomers are cured at high temperatures to achieve full cure, then thermal stability is improved, but storage and handling become more difficult
Solution Approach 1:
The patent incorporates terminal phthalonitrile groups in the monomer structure itself, enabling partial curing to occur during storage. This preliminary action allows the resin to achieve some degree of crosslinking at lower temperatures, improving storage stability without requiring high temperature processing
Solution Approach 2:
The patent enables partial curing of phthalonitrile monomers at lower temperatures through the terminal phthalonitrile groups. This partial action provides sufficient storage stability and handling ease while allowing full thermal performance to be achieved through subsequent post-curing at elevated temperatures
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
This method reduces synthesis costs, enhances processability by achieving partial curing at lower temperatures, and results in polymers with improved thermal and oxidative stability, suitable for various high-temperature applications.
Implementation Method 1
A method involving the reaction of bisphenol with chlorobenzophenone in the presence of an alkaline hydroxide base and a copper complex to form oligomeric aromatic ether-aromatic ketone phthalonitriles
Implementation Method 2
allowing for partial curing below 250°C using metal salts and strong acids, enabling the formation of shaped solids at lower temperatures
Implementation Method 3
The phthalonitrile monomers polymerize through the cyano groups with the aid of an appropriate curing agent to yield a crosslinked polymeric network with high thermal and oxidative stabilities
Data Source
AI summary
A composition having a mixture of the below compounds having a mole ratio of at least 1:20. Ar1 and Ar2 are independently selected aromatic groups. A composition comprising phthalonitrile compounds that comprise at least 5 mol % of the first compound below.A method of: providing a solution of a dichloroaromatic compound having an electron-withdrawing group bound to each aromatic ring containing one of the chloride groups; a dihydroxyaromatic compound or anion thereof; an organic transition metal complex or a transition metal salt; an alkaline hydroxide base; and a solvent; and heating the solution to a temperature at which the dichloroaromatic compound and the dihydroxyaromatic compound react to form a dimetallic salt of an aromatic ether oligomer. The molar ratio of the dihydroxyaromatic compound to the dichloroaromatic compound is greater than 2:1. Water formed during the heating is concurrently distilled from the solution.