Hypergolic Copper Cluster-Based Covalent Organic Frameworks.

Area of Science:

• Materials Science
• Chemistry
• Aerospace Engineering

Background:

• Developing hypergolic materials with rapid ignition and high energy density is crucial for advanced propulsion systems.
• Current hypergolic materials often face trade-offs between ignition speed and energy content.
• Covalent organic frameworks (COFs) offer a versatile platform for designing multifunctional materials.

Purpose of the Study:

• To create a novel covalent organic framework (COF) with synergistic hypergolic performance.
• To integrate catalytic centers and high-energy units within a single framework for enhanced propulsion applications.
• To establish a rational design strategy for functionalized hypergolic framework materials.

Main Methods:

• Synthesized a COF using trinuclear copper clusters as nodes and carborane building blocks.
• Utilized copper clusters as both structural components and catalytic centers for framework formation and linker activation.
• Investigated hypergolic performance with high-test peroxide as the oxidizer.
• Performed theoretical simulations to understand interfacial interactions and reaction mechanisms.

Main Results:

• The synthesized COF exhibited rapid ignition with an ignition delay time of 40 ms.
• The carborane cages within the COF imparted a high energy density of 25.9 kJ g^-1.
• Theoretical simulations confirmed strong interactions and low reaction barriers between the COF and oxidizer, validating the synergistic design.

Conclusions:

• The developed COF demonstrates a successful synergistic enhancement of hypergolic performance.
• This work presents a rational design strategy for constructing advanced hypergolic framework materials.
• The findings contribute to the development of next-generation propulsion technologies through tailored material design.