Soluble Carbon Phosphonitride Pre-polymers via Segmented Synthesis
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Solution Overview
Problem
Existing methods for producing carbon phosphonitride materials are limited by their insolubility and lack of versatility in forming desired shapes and forms, as they are typically produced as solid or film forms without a soluble intermediate stage.
Innovation Solution
A method involving the reaction of potassium cyanide or silver cyanide with phosphorus trichloride in polar aprotic solvents to produce a soluble, partially polymerized carbon phosphonitride pre-polymer, which can be manipulated and thermoset into various forms such as films or monoliths, allowing for enhanced processing and form factor flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carbon phosphonitride is produced by direct solid-solid transformation or film growth from solutions, then the material can be formed into solid or film structures, but the material remains insoluble and lacks versatility in forming desired shapes and forms
Solution Approach 1:
The patent segments the polymerization process into two distinct stages: first forming soluble oligomeric pre-polymers with controlled molecular weight and functionality, then subsequently crosslinking to form the insoluble carbon phosphonitride network. This segmentation allows the material to exhibit solubility during processing and insolubility in the final product, resolving the contradiction between formability and structural stability.
Solution Approach 2:
The patent performs preliminary polymerization to create soluble pre-polymers before final crosslinking. These pre-polymers contain reactive end groups that enable subsequent crosslinking but are soluble enough for processing into various forms. This preliminary action allows the material to be shaped and manipulated before the final insoluble structure is formed, achieving both versatility and stability.
2Ease of manufacture
If carbon phosphonitride is produced as a direct solid-solid transformation, then the material structure is simplified, but the material cannot be manipulated or cast into films and molds
Solution Approach 1:
The patent introduces soluble oligomeric pre-polymers as an intermediary state between the simple reactants and the final insoluble carbon phosphonitride product. These pre-polymers serve as a processing medium that can be dissolved, cast, and manipulated, bridging the gap between simple synthesis and complex form fabrication without requiring complex processing equipment.
3Adaptability or versatility
If the material is made soluble for processing, then form factor versatility is improved, but the thermal stability and mechanical properties may be compromised
Solution Approach 1:
The patent creates a dynamic material system where the polymerization degree and crosslinking density can be controlled during processing. The pre-polymers start with lower crosslinking for solubility and processability, then progressively crosslink to achieve the desired mechanical properties and thermal stability in the final product. This dynamic control allows optimization of both processing and performance.
Solution Approach 2:
The patent controls the polymerization parameters to create pre-polymers with specific molecular weights and functionality distributions. By adjusting reaction conditions such as monomer ratio, temperature, and catalyst, the patent optimizes the balance between solubility for processing and crosslinking density for mechanical strength, achieving both form versatility and material performance.
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 soluble pre-polymer enables the production of carbon phosphonitride materials with improved thermal stability, mechanical properties, and form factor versatility, overcoming the limitations of previous methods by allowing for the creation of stable, hard, and non-flammable monolithic materials with solubility similar to organic polymers.
Implementation Method 1
reacting potassium cyanide with phosphorus trichloride in a polar aprotic solvent (such as acetonitrile), thereby obtaining a pre-polymer comprising phosphorus, carbon, and nitrogen
Implementation Method 2
Solutions of this oligomeric form of carbon phosphonitride (hereafter designated as 'pre-polymer') can then be cast into films, molds
Data Source
AI summary
Described herein is the preparation of carbon phosphonitride pre-polymers that are soluble in organic solvents and can be further thermoset into carbon phosphonitride extended solids (i.e. films, monoliths, etc.) with an approximate empirical formula of C3N3P.