Tetrazole-Based Cross-Linked Polymers for Energetic Binders
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Solution Overview
Problem
Current energetic binders for pyrotechnics, gun propellants, rocket propellants, and explosives are chemically unstable, leading to safety concerns and reduced performance due to their organic azides or nitrate esters, which require costly monitoring and result in impaired physical properties and increased binder content.
Innovation Solution
Development of dihydroxy-terminated bis-tetrazole-based polymers, specifically a process involving reacting tetrazole polyols with isocyanate resins to create multifunctional cross-linked polymers with improved flexibility and stability, incorporating alkyl chains for enhanced solubility and stability, and using catalysts and fillers to produce a more efficient binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic azides or nitrate esters are used as energetic binders, then energy content is improved, but chemical stability and safety deteriorate
Solution Approach 1:
The patent changes the chemical parameter of the binder from traditional organic azides or nitrate esters to tetrazole-based polymers. This parameter change maintains the energetic functionality while dramatically improving chemical stability and safety, eliminating the need for costly monitoring programs and allowing higher binder content without compromising safety.
Solution Approach 2:
The patent employs composite material structure by incorporating tetrazole functional groups into the polymer backbone, creating a multifunctional binder that combines structural integrity with energetic properties. The cross-linked polymer matrix integrates the tetrazole groups systematically, providing both mechanical strength and controlled energy release characteristics.
2Use of energy by moving object
If nitrate esters are used as binder materials, then energy content is improved, but safety and monitoring costs worsen
Solution Approach 1:
The patent fundamentally changes the chemical composition parameter from nitrate esters to tetrazole-based polymers. This substitution eliminates the safety hazards associated with nitrate esters while preserving the energetic content, allowing the binder to be used at higher concentrations without requiring expensive monitoring programs or compromising safety.
3Quantity of substance
If higher binder content is used to achieve adequate coating, then coating coverage is improved, but physical properties deteriorate
Solution Approach 1:
The patent uses a cross-linked polymer composite structure where tetrazole functional groups are integrated into the backbone. This composite architecture provides both adequate coating coverage and maintains superior physical properties, eliminating the need to increase binder content at the expense of mechanical strength.
Solution Approach 2:
The patent optimizes the local distribution and integration of tetrazole groups within the polymer matrix. By incorporating these functional groups directly into the backbone rather than as pendant moieties, the binder achieves effective coating at lower concentrations while maintaining excellent physical properties throughout the material structure.
4Use of energy by moving object
If pendant energetic groups are attached to polymer, then energy content is improved, but physical properties worsen
Solution Approach 1:
The patent inverts the traditional approach by incorporating energetic tetrazole groups into the polymer backbone rather than attaching them as pendant side groups. This inversion integrates the energetic functionality into the fundamental structure, providing both energy content and superior physical properties simultaneously, as the backbone structure itself provides mechanical strength.
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 tetrazole-based polymers offer improved mechanical properties, increased thermal stability, and reduced reactivity, allowing for higher binder content without safety risks, enhancing energy density and processing efficiency while minimizing the need for costly monitoring programs.
Implementation Method 1
reacting an effective amount of tetrazole polyol with isocyanate resin, wherein [R] is chemically bonded to N1 or N2 position
Data Source
AI summary
A cross-linked polyisocyanate polymer and a process for preparation of a polymer having the general structure (I) including reacting an effective amount of tetrazole polyol with isocyanate resin, combining at a temperature in the range of about 50° C. to about 100° C. for a time period in the range of about 1 to about 24 hours and cooling to room temperature producing a cross-linked polyisocyanate polymer.