Ester-Based Reactive Plasticizer for PBX
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Solution Overview
Problem
Current polymeric binders and plasticizers used in plastic bonded explosives (PBXs) face challenges such as low heat stability, non-compatibility with explosives, low processability, and the issue of plasticizer migration, which reduces sensitivity and storage stability over time.
Innovation Solution
A high-energy alkyne-based reactive plasticizer is introduced that binds to the polymer binder through a click reaction during the curing process, forming an ester-based compound, thereby reducing viscosity and preventing plasticizer migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional polymeric binders and plasticizers are used in PBXs, then processability and mechanical properties are improved, but plasticizer migration occurs over time leading to increased sensitivity and decreased storage stability
Solution Approach 1:
The patent combines the plasticizer function and binder function into a single integrated compound. The reactive plasticizer contains both plasticizing moieties (for plasticization effect) and reactive groups (for covalent bonding to the binder), merging two separate functions into one material that eliminates migration while maintaining processability.
Solution Approach 2:
The reactive plasticizer is pre-designed with reactive groups that will form covalent bonds with the binder during the curing process. This preliminary structural design ensures that once bonded, the plasticizer becomes an integral part of the binder network, preventing subsequent migration and ensuring long-term storage stability.
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 reactive plasticizer introduces energetic functional groups locally within specific molecular structures (such as nitro, nitrate, or nitramine groups attached to the plasticizer backbone) rather than uniformly throughout the entire binder system. This localized energy enhancement maintains heat stability and compatibility while increasing overall energy density.
3Reliability
If reactive plasticizer is used to prevent migration, then storage stability is improved, but synthesis complexity increases
Solution Approach 1:
The reactive plasticizer employs parameter optimization in its molecular design, selecting reactive groups and molecular weights that balance synthesis feasibility with migration prevention. The reactive groups are chosen to be sufficiently reactive to form stable bonds but not so complex that synthesis becomes prohibitively difficult, achieving an optimal parameter set that resolves the contradiction.
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 enhances energy density and processability while maintaining insensitivity and stability, preventing plasticizer migration and improving long-term storage properties of PBXs.
Implementation Method 1
A high-energy alkyne-based reactive plasticizer is introduced that binds to the polymer binder through a click reaction during the curing process, forming an ester-based compound
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 migration by being bonded with a polymer binder for a plastic bonded explosive.