Perfluoropyridine Monomers for High Char Yield Aerospace Polymers

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Solution Overview

Problem

Cyanate ester resins used in aerospace applications are problematic due to the use of toxic materials, short shelf life, potential for hydrogen cyanide generation, uneven curing, and limited char yields, with bis-ortho-diynylarenes offering limited functionalization and requiring transition metal chemistry.

Innovation Solution

Perfluoropyridine derived aromatic monomers that can be easily and selectively functionalized through an efficient and environmentally friendly pathway, producing polymers with high char yields, synthesized via lithiation of diphenylacetylene and perfluoropyridine, followed by curing under a nitrogen atmosphere.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cyanate ester resins are used for aerospace applications, then the materials provide adequate performance, but the manufacturing process uses toxic raw materials and generates harmful substances

Engineering Contradiction:

Improvematerial performanceVSAvoidtoxic raw materials and hydrogen cyanide generation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces toxic cyanate ester chemistry with perfluoropyridine-derived monomers that eliminate hydrogen cyanide generation while maintaining high-temperature performance and char yield. The harmful cyanide pathway is converted into a benign fluorinated aromatic system that provides equivalent or superior aerospace material performance without the toxic byproducts.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention changes the chemical composition parameters from cyanate ester-based systems to perfluoropyridine-derived aromatic monomers. This parameter change eliminates the toxic raw materials and harmful decomposition products while preserving the high-temperature stability and mechanical properties required for aerospace applications.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If cyanate ester resins are used, then the materials can be processed, but they have short shelf life and require careful control to prevent degradation

Engineering Contradiction:

ImproveprocessabilityVSAvoidshelf life

Core Design Contradiction:

Ease of operationVSDuration of action of stationary object

Solution Approach 1:

The patent replaces the short-lived cyanate ester resins with perfluoropyridine-derived monomers that have extended shelf life. The fluorinated aromatic structure provides inherent stability that eliminates the rapid degradation and hydrogen cyanide generation issues of cyanate esters, allowing for longer storage and more flexible processing windows without compromising material performance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If bis-ortho-diynylarenes are used to achieve satisfactory char yields, then the char yield is improved, but the functionalization ability is extremely limited and requires transition metal chemistry

Engineering Contradiction:

Improvechar yieldVSAvoidfunctionalization ability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The perfluoropyridine-derived aromatic monomers provide multiple functional groups that enable diverse chemical transformations and material applications. Unlike bis-ortho-diynylarenes that require specialized transition metal chemistry for functionalization, the fluorinated aromatic monomers offer versatile reaction pathways for introducing various functional groups, enabling both high char yield and broad adaptability for different aerospace applications.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 monomers enable the production of polymers with satisfactory char yields, overcoming the limitations of cyanate ester resins and bis-ortho-diynylarenes by providing a more efficient and environmentally friendly synthesis process for high-performance materials.

Implementation Method 1

synthesized via lithiation of diphenylacetylene and perfluoropyridine

Methodology Applied

Scientific EffectLithiation:

Implementation Method 2

The preparation of perfluoropyridine derived aromatic monomers involves the lithiation of diphenylacetylene and perfluoropyridine

Methodology Applied

Scientific EffectNucleophilic aromatic substitution:

Data Source

PatentUS10975032B1Perfluoropyridine derived aromatic monomers and processes of making and using same

Publication Date: 2021.04.13 THE GOVERNMENT OF THE UNITED STATES AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE

AI summary

The present invention relates to perfluoropyridine derived aromatic monomers and processes of making and using same. Such monomers can be easily and selectively functionalized and yet still synthesized by an efficient and environmentally friendly pathway. In addition, such monomers can be used to produce polymers with highly satisfactory char yields.