Synthesis and properties of borane‐containing ionic liquids based on biferrocene

Abstract

To develop a new type of energetic ionic liquid (EIL) that has a catalytic effect on the thermal decomposition of ammonium perchlorate (AP) and can be ignited in white fuming nitric acid (WFNA), six borane-containing ionic liquids based on biferrocene were successfully synthesized, and their structures were determined by x-ray crystallography. Except for iodized salts, four EILs with high thermal stability burned rapidly in WFNA, one of which, bis [1-(ferrocenylmethyl)imidazole-3-yl] dihydroboronium cyanoborohydride, [Fcmim][BH 3 CN], produced the shortest ignition delay (ID) time of 5 ms. However, iodized salts demonstrated a better catalytic effect on AP than did BH 3 CN À -or N(CN) 2 À -based EILs and bis[1-(ferrocenylmethyl)benzimidazole-3-yl] dihydroboronium iodide, [Fcbemim][I], could advance the final thermal decomposition temperature of AP by 50 C. Anions have a significant effect on the structures and performances of ionic liquids.

Catalytic combustion of a dendrimer containing ferrocene units with anti‐migration performance on composite propellant

“…15 Although these catalysts have excellent performance in the enhancement of the burning rate, they are easy to migrate from the interior of the propellant to the surface. To obtain efficient BRCs, some researchers have tried to modify the ferrocene, for example, increasing the molecular weight or polarity, [16][17][18] grafting ferrocene onto polymers, [19][20][21] or even immobilizing ferrocene on some solid support. [22][23][24] These ferrocene derivatives have made great progress in the anti-migration performance of the BRCs, but the increased molecular weight of ferrocene derivatives also increases the dead mass of the catalyst in the propellant formulation, which is not the result expected by industrial production.…”