Bis-isoxazole Tetranitrate Plasticizer Thermal Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current energetic plasticizers, such as nitroglycerin, suffer from thermal instability and high volatility, leading to safety concerns and reduced performance in melt-castable explosive and propellant applications, necessitating the development of high-energy, stable alternatives.
Innovation Solution
The synthesis of 3,3′-bis-isoxazole-4,4′,5,5′-tetrylbis(methylene) tetranitrate (BITN) through a multi-step process involving the reaction of dichloroglyoxime with 2-butyne-1,4-diol and subsequent nitration, which results in a compound with improved thermal stability and reduced sensitivity, suitable for use as an energetic plasticizer and melt-castable eutectic explosive ingredient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If nitrate-based plasticizers like nitroglycerin are used to enhance energy yield, then the energy performance of propellant is improved, but thermal stability and sensitivity worsen
Solution Approach 1:
The patent modifies the molecular structure of nitrate ester plasticizers by replacing secondary carbon nitrate groups with primary carbon nitrate groups and introducing cyclic ether rings. This structural parameter change increases thermal stability (decomposition temperature raised from 50°C to above 150°C) while maintaining high energy content through retained nitrate ester functionalities.
Solution Approach 2:
The invention creates composite molecular structures combining nitrate ester groups (for high energy) with cyclic ether rings (for thermal stability). The resulting hybrid structure integrates the energy-dense nitrate functionality with the thermally stable cyclic ether framework, achieving both high energy yield and improved reliability.
2Use of energy by moving object
If oxygen-balanced nitrate ester plasticizers are used to maximize propellant performance, then energy density is improved, but volatility and sensitivity to thermal insults increase
Solution Approach 1:
The patent changes the molecular parameters by using primary nitrate esters on cyclic ether structures instead of secondary nitrate esters on linear chains. This parameter change reduces volatility and sensitivity to thermal insults while maintaining oxygen balance and energy density, as the cyclic structure provides greater molecular rigidity and lower vapor pressure.
3Power
If traditional TNT-based melt-cast materials are used, then explosive performance is achieved, but environmental concerns worsen
Solution Approach 1:
The patent develops new melt-castable explosive compositions based on cyclic ether nitrate esters with melting points between 70-120°C and high densities (above 1.5 g/cm³). These materials achieve explosive performance comparable to or exceeding TNT while being environmentally benign, as they decompose into less harmful products and do not persist in the environment like traditional TNT.
4Object-generated harmful factors
If DNAN-based melt-castable eutectic formulations are used to replace TNT, then environmental impact is reduced, but explosive power deteriorates
Solution Approach 1:
The invention creates composite explosive formulations using cyclic ether nitrate esters combined with other energetic materials to achieve eutectic mixtures with optimized performance. These composite formulations exceed the explosive power of DNAN (detonation velocity >5670 m/s, density >1.5 g/cm³) while maintaining environmental benefits, effectively replacing both TNT and DNAN.
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
BITN exhibits high thermal stability, reduced sensitivity, and enhanced performance as a plasticizer, offering improved safety and energy yield in propellant and explosive formulations, with potential to replace existing nitrate-based materials like TNT and DNAN, while maintaining compatibility with nitrocellulose.
Implementation Method 1
nitrate ester-based plasticizers...decomposes at 50° C....decompose at temperatures around 150° C.
Implementation Method 2
A propellant is an energetic substance that is used to project a vehicle, bullet or other object, typically through the formation of hot, low molecular weight gases.
Implementation Method 3
a melting point between 70-120° C....BITN exhibits high thermal stability...suitable for use as an energetic plasticizer and melt-castable eutectic explosive ingredient
Data Source
AI summary
A method and compound includes mixing a salt compound to 2-butyne-1,4-diol in an alcohol to create a mixture; adding a solution of dichloroglyoxime in an alcohol to the mixture to create 3,3′-bis-isoxazole-4,4′,5,5′-tetryltetramethanol; and nitrating the 3,3′-bis-isoxazole-4,4′,5,5′-tetryltetramethanol to create 3,3′-bis-isoxazole-4,4′,5,5′-tetrylbis(methylene) tetranitrate, which has the structural formula:The alcohol may include ethanol, wherein the adding may occur at 60° C., or alternatively the adding may occur at 80° C. The alcohol may include n-butanol, wherein the adding may occur at 100° C., or alternatively the adding may occur at 120° C. The mixing may occur at 120° C. The method may further include cooling the nitrated 3,3′-bis-isoxazole-4,4′,5,5′-tetryltetramethanol to 0° C.; stirring the cooled nitrated 3,3′-bis-isoxazole-4,4′,5,5′-tetryltetramethanol for at least four hours creating a precipitate; warming the precipitate; pouring the precipitate onto ice while stirring creating a solid material; collecting the solid material; and drying the solid material to yield the 3,3′-bis-isoxazole-4,4′,5,5′-tetrylbis(methylene) tetranitrate.