Tetrazole-Based Linear Polymers for Stable Energetic Binders

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Solution Overview

Problem

Current energetic binders for pyrotechnics, gun propellants, rocket propellants, and explosives are chemically unstable, requiring costly monitoring and impairing physical properties due to pendant energetic moieties, necessitating higher binder content and compromising safety and performance.

Innovation Solution

Development of dihydroxy-terminated bis-tetrazole polymers with flexible backbones, synthesized on a multigram scale, which are more thermally stable and incorporate energetic functionality into the polymer backbone, allowing for higher binder percentages without safety concerns, and reacting with isocyanate resins to produce linear polyisocyanate polymers with improved mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional energetic binders (polyglycidyl nitrate, polyglycidyl azide, etc.) are used to increase binder content, then energy density is improved, but safety deteriorates due to chemical instability and sensitivity

Engineering Contradiction:

Improveenergy densityVSAvoidsafety

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the binder by replacing traditional nitrate ester and organic azide groups with tetrazole rings. This parameter change maintains high energy content while dramatically improving thermal stability and reducing chemical reactivity, thereby resolving the contradiction between energy density and safety

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite binder system combining tetrazole rings integrated into the polymer backbone with polyurethane or polyurea matrix. This composite structure incorporates energetic functionality directly into the backbone rather than using pendant moieties, achieving both high energy density and improved safety through the stable tetrazole core

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If conventional energetic binders with pendant energetic moieties are used, then energy content is improved, but physical properties deteriorate requiring higher binder content

Engineering Contradiction:

Improveenergy contentVSAvoidphysical properties

Core Design Contradiction:

Use of energy by moving objectVSStrength

Solution Approach 1:

The patent transitions from pendant energetic moieties (attached side-groups) to backbone-integrated tetrazole rings (main-chain structure). This dimensional repositioning of the energetic functionality from side-chains to the polymer backbone improves mechanical properties while maintaining energy content, as the rigid tetrazole rings provide structural reinforcement

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Use of energy by moving object

If nitrate esters are used as binder materials, then energy content is improved, but safety deteriorates requiring expensive monitoring programs

Engineering Contradiction:

Improveenergy contentVSAvoidsafety monitoring requirements

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent replaces expensive, safety-critical nitrate ester binders that require continuous monitoring with tetrazole-based binders that inherently possess superior stability. This substitution eliminates the need for expensive monitoring infrastructure while maintaining or improving energy content, making the system both cheaper and safer

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Quantity of substance

If higher binder content is used to achieve adequate coating, then coating coverage is improved, but safety deteriorates due to increased chemical reactivity

Engineering Contradiction:

Improvebinder contentVSAvoidsafety

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the chemical composition parameter of the binder from reactive nitrate esters and organic azides to thermally stable tetrazole rings. This parameter change allows formulation with higher binder content (improving coating coverage) without the safety penalties that would normally accompany increased binder quantity, as the tetrazole structure resists decomposition and unwanted reactions

Inventive Principle:

Principle #35Parameter changes

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 enhance energy density, mechanical properties, and safety by reducing chemical reactivity and sensitivity, enabling higher binder content without compromising performance, and providing a stable and flexible binder for explosives and propellants.

Implementation Method 1

reacting with isocyanate resins to produce linear polyisocyanate polymers

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Data Source

PatentUS7557220B1Tetrazole based linear polymers

Publication Date: 2009.07.07 SEC OF THE NAVY AS REPRESENTED BY THE UNITED STATES OF AMERICA CHIEF OF NAVAL RES

AI summary

A linear isocyanate polymer produced by utilizing an effective amount of tetrazole diol or tetrazole polyol, reacting with an effective amount isocyanate resin, and cooling to room temperature producing a linear polyisocyanate polymer.