Reactive Plasticizer for PBX Stability
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Solution Overview
Problem
Current energetic materials face challenges in achieving high performance and insensitivity while preventing plasticizer migration, which leads to increased sensitivity and reduced storage stability in plastic bonded explosives (PBXs).
Innovation Solution
A high-energy alkyne-based reactive plasticizer is introduced that binds to a polymer binder through a click reaction during the curing process, reducing plasticizer migration and enhancing energy density and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional plasticizers are used in PBXs, then processability and mechanical properties are improved, but plasticizer migration occurs over time leading to increased sensitivity and reduced storage stability
Solution Approach 1:
The patent combines the plasticizer function with the binder function into a single polyurethane polymer molecule. The polymer contains both binder segments (providing structural integrity) and plasticizer segments (providing flexibility and processability), eliminating the need for separate plasticizer additives and preventing migration issues.
Solution Approach 2:
The invention creates a composite polymer structure with multiple functional segments - hard segments providing structural strength and soft segments providing plasticizing effects. This internal composite structure integrates the benefits of both binder and plasticizer while preventing phase separation and migration.
2Use of energy by moving object
If energetic functional groups are introduced to increase energy density, then energy level of PBX is improved, but heat stability and compatibility with explosives deteriorate
Solution Approach 1:
The patent introduces energetic functional groups locally at specific positions within the polymer chain rather than uniformly throughout. This allows energy enhancement at target locations while maintaining the overall thermal stability and compatibility of the polymer matrix.
Solution Approach 2:
The invention modifies the chemical structure of the polymer by introducing energetic functional groups (such as nitro, nitrate, or azido groups) to change the energy parameters of the material while carefully controlling the concentration and distribution to maintain thermal stability and explosive compatibility.
3Object-affected harmful factors
If polyurethane polymeric binder is used to make high-energy materials insensitive, then insensitiveness is improved, but energy density of PBX is reduced
Solution Approach 1:
The patent designs a polyurethane polymer that simultaneously performs multiple functions: binder (structural integrity), plasticizer (flexibility and insensitivity), and energetic additive (energy density enhancement). This multi-functional polymer eliminates the need to choose between insensitivity and energy density.
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 reactive plasticizer effectively prevents plasticizer migration, improving the long-term stability and energy density of PBXs while maintaining mechanical properties and safety.
Implementation Method 1
A high-energy alkyne-based reactive plasticizer is introduced that binds to a polymer binder through a click reaction during the curing process
Data Source
AI summary
Disclosed is an energetic reactive plasticizer for a plastic bonded explosive (PBX), and specifically an energetic reactive plasticizer for PBX which has high performance and insensitiveness without a plasticizer leak by being bonded with a polymer binder for a plastic bonded explosive.