Nitrogen-Rich Energetic Polymers for Fire Protection
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Solution Overview
Problem
Current fire protection systems and automotive airbag materials face issues with toxicity, environmental hazards, and inefficiency due to the use of chemicals like Halon 1301, HFCs, and sodium azide, which are either harmful to the environment or pose health risks, and existing energetic compounds are impact-sensitive, difficult to synthesize, and lack sufficient energy.
Innovation Solution
Development of nitrogen-rich energetic polymers formed from monomers such as 1,2,4,5-tetrazine and guanidine moieties, which can be polymerized to create stable, non-toxic, and energetic materials suitable for fire protection and airbag applications, using click polymerization and other methods to control burn-rate and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical substances like sodium azide are used to produce inert gases rapidly, then the fire protection efficiency is improved, but the toxicity and environmental hazards increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters by using nitrogen-rich polymers with specific molecular structures (containing triazole, tetrazole, or triazine rings) instead of traditional small molecule compounds like sodium azide. This parameter change maintains the rapid gas generation capability while significantly reducing toxicity, as the polymer structure provides inherent stability and the decomposition products are primarily nitrogen gas and water vapor.
Solution Approach 2:
The invention employs composite material strategies by creating polymer structures that combine multiple nitrogen-rich functional groups (triazole, tetrazole, triazine) within a single macromolecular framework. This composite approach at the molecular level allows the material to achieve both high energy density for rapid gas generation and enhanced stability for reduced toxicity, as the distributed nitrogen groups work synergistically while the polymer backbone provides structural integrity and controlled decomposition.
2Use of energy by moving object
If traditional energetic compounds are used, then the energy output is sufficient, but the impact sensitivity and synthesis difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the energetic function into multiple distributed nitrogen-rich groups (triazole, tetrazole, triazine) along the polymer chain, rather than relying on a single high-energy bond. This segmentation distributes the energy storage function across multiple stable structural units, reducing impact sensitivity while maintaining high energy output. The polymer structure allows each nitrogen group to contribute to the overall energy release during decomposition without requiring extreme sensitivity to external stimuli.
Solution Approach 2:
The polymer backbone acts as an intermediary structure that connects and stabilizes the nitrogen-rich functional groups. This intermediary polymer framework provides a stable matrix that controls the decomposition kinetics, allowing energy release while reducing impact sensitivity. The polymer structure mediates between the high-energy nitrogen groups and the external environment, enabling controlled energy output without the extreme sensitivity characteristic of traditional small molecule explosives.
3Reliability
If Halon 1301 is used for fire protection, then the fire extinguishing efficiency is high, but the environmental damage to the ozone layer occurs
Solution Approach 1:
The patent converts the harmful environmental impact into a benefit by designing materials that decompose into environmentally benign products. The nitrogen-rich polymers decompose primarily into nitrogen gas and water vapor, which are harmless to the environment, while still providing the rapid gas generation needed for fire suppression. This transforms the traditional trade-off between effectiveness and environmental harm into a solution that achieves both fire protection and environmental compatibility.
4Object-generated harmful factors
If HFCs are used as fire protection agents, then the environmental friendliness is improved, but the fire extinguishing effectiveness decreases by 10-fold
Solution Approach 1:
The patent changes the physical and chemical parameters by using nitrogen-rich polymers with high nitrogen content (greater than 30% by weight) and specific molecular structures that enable rapid decomposition into large volumes of inert gas. This parameter change allows the material to achieve both environmental friendliness (decomposing into nitrogen and water) and high fire extinguishing effectiveness (rapid gas generation), overcoming the 10-fold effectiveness reduction seen with HFCs.
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 nitrogen-rich energetic polymers offer improved safety, environmental friendliness, and energy performance by reducing toxicity, volatility, and synthesis challenges, while enabling control over energetic properties and macroscopic forms.
Implementation Method 1
wherein the polymerizable groups of the first and second monomers are capable of undergoing a click polymerization reaction that forms a polymer
Implementation Method 2
chemical substances that can rapidly produce large quantities of inert gases... leave practically no residues behind after they discharge
Data Source
Figure 1A
Figure 1B
AI summary
Energetic nitrogen-rich monomers represented by the general Formula (I); wherein each of X1 and X2 is independently NR or a covalent bond, R is H or C1-4 alkyl, each of T1 and T2 is independently a moiety selected from the group consisting of a triazole moiety, a tetrazole moiety and a guanidine moiety, at least one of T1 and T2 being substituted by at least one polymerizable group, are disclosed herein, as well as polymers based thereon, and uses of such polymers.