Preparation, characterization, and thermal decomposition kinetics of high test peroxide gel

High test peroxide gel was prepared by low temperature freezing under the action of calcium ion compound with sodium alginate as a gelling agent. The High test peroxide gel was characterized by ultra depth of field microscope, Fourier infrared spectrometer, rheometer, synchronous thermal analyzer, and electron microscope scanner. The thermal decomposition behavior and reaction kinetics of the gel were investigated. The effective content of H₂O₂ in the gel before and after aging was also analyzed by KMnO₄ titration. The results show that the content of sodium alginate and the concentration of calcium ion compound directly affect the gelling and rheological properties of high test peroxide gel, and the gel with low sodium alginate content had a more uniform tissue structure. The E_α and lg(A/s⁻¹) of the high test peroxide gel decomposition reaction are 69.10 kJ mol⁻¹ and 9.13, respectively. Na₂O, CaO, CaCl₂ and CaSO₄ are the main components of the high test peroxide gel thermal decomposition condensate products. After ignition, a boron-based high test peroxide gel propellant can produce a steady combustion. After being stored at 263 K for 20 days, the effective content of H₂O₂ in the gel is 96.50%, and the decomposition rate is only 0.63%.