Safe Fabrication, Thermal Decomposition Kinetics, and Mechanism of Nanoenergetic Composite NBC/CL-20

Abstract

Benefiting from the sol−gel technology and vacuum freeze-drying technology, a novel nanoenergetic composite material nitrated bacterial cellulose (NBC)/CL-20 (hexanitrohexaazaisowurtzitane) has been fabricated. The thermal decomposition kinetic and mechanism have been studied by thermogravimetric analysis−differential scanning calorimetry (TG−DSC) under nonisothermal conditions in a nitrogen atmosphere at multiple heating rates; the process and mechanism of thermal decomposition of NBC/CL-20 1:1 have also been probed by TG−DSC−IR. The kinetic and thermodynamic parameters, such as activation energy (E a ), per-exponent factor (ln A K ), rate constant (k), activation heat (ΔH ⧧ ), activation free energy (ΔG ⧧ ), and activation entropy (ΔS ⧧ ) are calculated. The results indicate that NBC/CL-20 presents much lower activation energy than both of raw NBC and raw NC, and NBC/CL-20 1:1 exhibits superior thermal performance of heat release and E a . Moreover, there the existence mechanism has also been probed between NBC and CL-20 during the process of thermal decomposition. The structure and composition have been characterized by a series of characterization methods and indicate that CL-20 has been embedded homogenously in the NBC gel matrix with a prominent porous cross-linked network structure. The impact and friction sensitivities have also been decreased. The whole process effectively avoids high temperatures, and thus ensures operational safety.

Synthesis of 3D Porous Network Nanostructure of Nitrated Bacterial Cellulose Gel with Eminent Heat‐Release, Thermal Decomposition Behaviour and Mechanism

“…Encouragingly, the emerging of nitrated bacterial cellulose (NBC) is a promising substantial energetic binder, which can be (partial) substituted of NC attributed to its excellent purity and unique porous network structure. It is able to grant strengthen mechanical performance and safety properties with propellants [6–8]. Up to now, Wang et al.…”

Fabrication of nitrocellulose‐based nanoenergetic composites, study on its structure, thermal decomposition kinetics, mechanism, and sensitivity

“…For example some inert matrix, SiO 2 -matrix, [24] RF (resorcinol-formaldehyde)-matrix, [25] PU (polyurethane)matrix, [26] cellulose-matrix, [27] and Fe 2 O 3 -matrix. [28] In addition, previous works also prepared a series of energetic gel matrix, for instance NC-matrix, [11,29] GAP (glycidyl azide polymer)-matrix, [30] BAMO-THF (3, 3-Bis (azidomethyl) oxetanetetrahydrofuran copolymer)matrix, [31] and NBC (nitrated bacterial cellulose)-matrix nEMs, [32] which can not only reduce the sensitivity, but also maintain the energy performance of composites compared with that of inert matrix nEMs.…”

Preparation of self-assembled FOX-7 nanosheets and their performance

“…This is because the addition of EA greatly reduces the particle sizes of the prepared FOX-7 nanosheets and increases their specific surface area, and at the same time, the gas produced by EA decomposition has a catalytic effect on the decomposition of the prepared FOX-7 nanosheets. 39,40 So, the apparent thermal decomposition enthalpy of the prepared FOX-7 nanosheets increases with the increase of the EA content.…”