Safe Fabrication, Thermal Decomposition Kinetics, and Mechanism of Nanoenergetic Composite NBC/CL-20.
Safe Fabrication, Thermal Decomposition Kinetics, and Mechanism of Nanoenergetic Composite NBC/CL-20.
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DOI：
10.1021/acsomega.0c04958
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发表时间：
2020-12-08
期刊：
影响因子：
4.1
通讯作者：
Liu J
中科院分区：
文献类型：
--
作者：
Chen L;He W;Liu J
利用溶胶-凝胶技术和真空冷冻干燥技术，制备了硝化细菌纤维素（NBC）/CL-20（六硝基六氮杂异伍兹烷）纳米含能复合材料。采用热重分析-差示扫描量热法（TG-DSC）研究了NBC/CL-201：1在氮气气氛中不同升温速率下的非等温热分解动力学和机理，并采用TG-DSC-IR对NBC/CL-201：1的热分解过程和机理进行了探讨。计算了反应的动力学和热力学参数，如活化能（Ea）、每指数因子（ln AK）、速率常数（k）、活化热（ΔH <$）、活化自由能（ΔG <$）和活化熵（ΔS <$）。结果表明，NBC/CL-20的活化能远低于NC和NBC原料，NBC/CL-201：1的放热性能和Ea均上级NC原料。此外，还探讨了NBC与CL-20在热分解过程中的存在机理。的结构和组成已被其特征在于通过一系列的表征方法，并表明CL-20已嵌入均匀的NBC凝胶基质具有突出的多孔交联网络结构。冲击和摩擦灵敏度也有所降低。整个过程有效地避免了高温，从而确保了操作安全。
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-201:1 have also been probed by TG–DSC–IR. The kinetic and thermodynamic parameters, such as activation energy (Ea), per-exponent factor (ln AK), 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-201:1 exhibits superior thermal performance of heat release and Ea. 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.
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