|Ph.D Student||Sevilia Sagi|
|Subject||New Energetic Materials|
|Department||Department of Chemistry||Supervisor||Professor Yoav Eichen|
|Full Thesis text - in Hebrew|
This thesis presents the preparation and characterization of energetic room temperature ionic liquids and the syntheses and polymerization of novel three-dimensional printable energetic monomers family. Both based on azoles, with focus on imidazoles. Energetic materials provide the ability to pinpoint force onto a target and move or destroy it. However, due to their inherent properties they constitute a danger to the handlers or operators in the field. The concept of binary energetic materials such as Helix, Tannerite or PLX provides an attractive solution to the problem. Specifically, if the two components are innocuous when separated but become energetic upon mixing this would provide a solution to the safety issue. The challenge is therefore to identify two components, a fuel and an oxidizer, that have low vapor pressures at room temperature, are stable to heat and mechanical force when separated, mix endothermically or thermo-neutrally and remain liquids after mixing. Structurally imidazoles contain a highly nucleophilic nitrogen allowing easy functionalization via alkylation and in addition possessing a moderately basic nitrogen that might allow easy mixing with an oxidizing salt with low generation of heat.
In addition Solid composite propellants and explosives normally contain an energetic material (filler), embedded in an elastic binder. The cured mixture, a solid yet somewhat elastic composition, is tailored to possess the desired combustion and mechanical properties derived from the application and service conditions, such as stress loadings, mechanical integrity, burn rate, combustion temperature and specific impulse in the case of propellants. With the new energetic ionic liquids prepared we were able to apply a well-known 3D printing technique to photo-polymerize at the first time energetic polymers.
Within those projects not only we were able to prepare and characterize new energetic materials which are safe to make and use, but also to create an energetic polymers made of new energetic building blocks, synthesized for this use.