Synthesis, Characterization And Thermal Performance Study Of Fullerene-Poly(glycidyl Nitrate) Metal Salt(Pb/Cu)

With the advances of weapon systems, now the high-performance composite solid propellant has been gotten more attention. As the burning modifier of solid propellant, catalyst is considered an indispensable and important component in solid propellant conpositions. Therefore to explore an excellent catalyst is a research focus in solid propellant field for now and the aim of this paper. [60]Fullerene(C60) has unique molecular structure and physical properties. Therefore it is an excellent solid rocket fuel additive that can replace carbon black. With the advantages of high energy, low sensitivity, excellent mechanical properties and thermal properties at low temperature, poly(glycidyl nitrate)(PGN) is widely studied and used in propellant in recent years. If PGN and lead/copper ions can be incorporated in C60, a new energetic fullerene derivative catalyst may be got, which will have higher energy and even better catalytic performance than other inert catalysts.Based on the previous work of fullerene itaconate lead/copper salts in our group, in this paper we designed and succeeded in introducing PGN in fullerene itaconate lead/copper salts to get 4 kinds of new energetic fullerene lead/copper salts including C60-PGN itaconic acid copolymer lead/copper salt and C60-PGN maleic acid copolymer lead/copper salts.(1) [60]Fullerene-poly(glycidyl nitrate)(C60-PGN) has been synthesized through five steps with fuming nitric acid, C60 and glycerol as main raw materials. C60-PGN itaconic/maleic acid copolymer lead/copper salts have been prepared through two steps by C60-PGN, itaconic acid, maleic acid and lead/copper nitrate as raw materials. FTIR, UV-vis, NMR, AAS, XRD and XPS were used to characterized the structures of the above products. The results showed that the goal products were successfully obtained.(2) The enthalpy of formation of C60-PGN was estimated by Van Krevelen and Chermin group methods, with f mDH=-1582 k J/mol. Detonation parameters of C60-PGN were approximate calculated by Kamlet-Jacobs equation with explosion heat Q=1156.0 k J/mol, detonation velocity D=3.217 km/s, detonation pressureP=3.616 GPa, respectively. Besides, TG-IR was used to identify the constituents of the thermal decomposition gas, further to analyse the thermal decomposition mechanism of C60-PGN.(3) The thermal stability analysis of the above 4 products was investigated by DTA and TG which revealed that they all exhibited good resistance to thermal decomposition up to 200°C. The thermal decomposition behaviors of C60-PGN and C60-PGN itaconic/maleic acid copolymer lead/copper salts were analyzed by DTA under different heating rates, and Kissinger method and Ozawa m ethod were used to calculate activation energy Ea and correlation coefficient r of the samples, which showed C60-PGN itaconic/maleic acid copolymer lead/copper salts had better thermal stability than C60-PGN.