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Synthesis of 3D Porous Network Nanostructure of Nitrated Bacterial Cellulose Gel with Eminent Heat-Release, Thermal Decomposition Behaviour and Mechanism
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-05-17 , DOI: 10.1002/prep.202100010 Ling Chen 1 , Xinfu Cao 2 , Jianbing Gao 2 , Yingbo Wang 1 , Yang Zhang 3 , Jie Liu 3 , Weidong He 1
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-05-17 , DOI: 10.1002/prep.202100010 Ling Chen 1 , Xinfu Cao 2 , Jianbing Gao 2 , Yingbo Wang 1 , Yang Zhang 3 , Jie Liu 3 , Weidong He 1
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In this study, a novel three-dimensional (3D) porous cross-link network structure of nitrated bacterial cellulose (NBC) nano-gel, as an energetic gel matrix for fabrication of nanocomposite energetic materials, (nEMs) was synthesized by sol-gel synthetic and the freeze-drying technology. The analysis results revealed that the unique network structure with abundant of nano-porous, which made the thermal behaviour of the NBC gel different from that of raw NBC. The thermal decomposition kinetic and mechanism of the NBC gel indicated that the exothermic peak temperature of the gel matrix decreased at low concentration, and the activation energy (Ea) of the gel0.5 (150000 J ⋅ mol−1) was much lower than that of raw NBC (223510 J ⋅ mol−1). However, the decomposition kinetic parameters of this study were not enough to illustrate the thermal properties, and which needs more effort to study them and complete. Furthermore, the initial reaction of gel decomposition was the splitting of urethane bond, and then the scission of −O−NO2 bonds happened, and the macromolecular chains’ breakage site of gel first occurred at −C−O−C− in the ring. After then, the chains of NBC break at −C−O−C− between the rings; notably, the heat-release of gel was several times than that of raw NBC, which was liberated during the process of thermal decomposition. This promising research may provide potential application in preparing binder-based nEMs and the basic theory of thermo-analysis used in propellants and explosives.
中文翻译：
具有显着放热、热分解行为和机理的硝化细菌纤维素凝胶 3D 多孔网络纳米结构的合成
在这项研究中，硝化细菌纤维素 (NBC) 纳米凝胶的新型三维 (3D) 多孔交联网络结构，作为用于制造纳米复合含能材料 (nEM) 的含能凝胶基质，通过溶胶-凝胶合成合成和冷冻干燥技术。分析结果表明，独特的网络结构具有丰富的纳米多孔结构，使得NBC凝胶的热行为与生NBC不同。NBC凝胶的热分解动力学和机理表明，凝胶基质的放热峰温度在低浓度下降低，凝胶的活化能（E a）0.5（150000 J ⋅ mol -1）远低于原始 NBC (223510 J ⋅ mol -1）。然而，本研究的分解动力学参数还不足以说明热学性质，需要进一步研究和完善。此外，凝胶分解的初始反应是氨基甲酸酯键的断裂，然后发生-O-NO 2键的断裂，凝胶的大分子链断裂位点首先发生在环中的-C-O-C- . 之后，NBC 的链在环之间的 -C-O-C- 处断裂；值得注意的是，凝胶的放热是生 NBC 的几倍，这是在热分解过程中释放出来的。这项有前途的研究可能为制备基于粘合剂的 nEM 以及推进剂和炸药中使用的热分析的基本理论提供潜在的应用。
更新日期：2021-05-17
中文翻译：
具有显着放热、热分解行为和机理的硝化细菌纤维素凝胶 3D 多孔网络纳米结构的合成
在这项研究中，硝化细菌纤维素 (NBC) 纳米凝胶的新型三维 (3D) 多孔交联网络结构，作为用于制造纳米复合含能材料 (nEM) 的含能凝胶基质，通过溶胶-凝胶合成合成和冷冻干燥技术。分析结果表明，独特的网络结构具有丰富的纳米多孔结构，使得NBC凝胶的热行为与生NBC不同。NBC凝胶的热分解动力学和机理表明，凝胶基质的放热峰温度在低浓度下降低，凝胶的活化能（E a）0.5（150000 J ⋅ mol -1）远低于原始 NBC (223510 J ⋅ mol -1）。然而，本研究的分解动力学参数还不足以说明热学性质，需要进一步研究和完善。此外，凝胶分解的初始反应是氨基甲酸酯键的断裂，然后发生-O-NO 2键的断裂，凝胶的大分子链断裂位点首先发生在环中的-C-O-C- . 之后，NBC 的链在环之间的 -C-O-C- 处断裂；值得注意的是，凝胶的放热是生 NBC 的几倍，这是在热分解过程中释放出来的。这项有前途的研究可能为制备基于粘合剂的 nEM 以及推进剂和炸药中使用的热分析的基本理论提供潜在的应用。
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