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Performance enhancement strategy for tetrazoles based on nitrogen-boron bonds
Kunkai Wang1, Kaidi Yang1, Heng Li1
1Xi'an Modern Chemistry Research Institute, Xi'an 710065, China. wangkk03@qq.com.
A new strategy using nitrogen-boron (N-B) bonds enhances tetrazole energetic performance, improving detonation and combustion. This method offers stable, safer, and more potent energetic materials for future development.
Area of Science:
- Energetic Materials Science
- Organic Chemistry
- Materials Science
Background:
- Tetrazoles are nitrogen-rich compounds with high energy potential but suffer from stability and acidity issues.
- Improving the energetic performance and safety of tetrazoles is crucial for advanced applications.
Purpose of the Study:
- To develop a novel strategy for enhancing the energetic performance of tetrazoles.
- To address the inherent acidity and stability limitations of tetrazoles.
- To investigate the impact of incorporating nitrogen-boron (N-B) bonds.
Main Methods:
- Selective construction of azolyl borane compound 7 via amino neighboring group participation.
- Evaluation of stability in water and air.
- Measurement of heat of detonation and combustion.
- Laser ignition experiments and Differential Scanning Calorimetry (DSC) for performance and thermal stability.
- Sensitivity tests (impact and friction) and computational electrostatic potential calculations.
- Thermogravimetric-Differential Scanning Calorimetry-Fourier Transform Infrared-Mass Spectrometry (TG-DSC-FTIR-MS) and in situ IR for decomposition product analysis.
Main Results:
- Azolyl borane compound 7 demonstrated excellent stability.
- Heat of detonation and combustion increased by 25% and 36%, respectively.
- Improved combustion performance and elevated thermal decomposition temperatures were observed.
- N-B covalent compounds exhibited favorable sensitivity (IS > 40 J, FS > 360 N).
Conclusions:
- The N-B bond strategy effectively enhances tetrazole energetic performance and stability.
- This approach mitigates tetrazole acidity and improves safety characteristics.
- Incorporating N-B bonds into nitrogen-rich compounds shows significant potential for developing next-generation energetic materials.
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