Preparation of Cellulose/CL-20 Composite Energetic Aerogels by Crystal Growth of CL-20 in Cellulose Solution,Crystal Growth & Design

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Preparation of Cellulose/CL-20 Composite Energetic Aerogels by Crystal Growth of CL-20 in Cellulose Solution
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-09-01 , DOI: 10.1021/acs.cgd.0c00909
Hongli Bian ₁ , Ziqiang Shao ₁ , Jianxin Liu ₁ , Ken Chen ₁ , Xuan Zhang ₂

Affiliation

Hexanitrohexaazaisowurtzitane (CL-20) is one of the most powerful high-energy explosives, used in the form of composite explosives due to its high mechanical sensitivity and the presence of crystal defects. Cellulose is widely known for its excellent compatibility and loading capacity as a green natural polymer. In this paper, cellulose/CL-20 composite energetic aerogels (CCAs) were developed by using cellulose as a carrier for CL-20 particles and 1-allyl-3-methylimidazolium chloride (AMIMCl) as a cosolvent for cellulose and CL-20. The crystal growth regularity of CL-20 was studied in the process of cellulose regeneration. The results show that CCAs maintain a 3D network structure where CL-20 crystals grow and adhere along the extension direction of the cellulose fibers. More specifically, cellulose fibers form a dense membrane structure on the surface of CL-20 crystals and CCAs with a coverage degree of 89.48%. The loading of CL-20 in CCAs is as high as 94.4%, and the crystal form remains unchanged. The thermal stability, impact sensitivity, and friction sensitivity properties of CCAs greatly improved in comparison with raw CL-20 due to the protection provided by the cellulose membrane and the formation of new chemical bonds between CL-20 and cellulose.

中文翻译：

CL-20在纤维素溶液中的晶体生长制备纤维素/ CL-20复合高能气凝胶

六硝基六氮杂异纤锌矿型结构烷烃（CL-20）是最强大的高能炸药之一，由于其较高的机械敏感性和存在晶体缺陷，因此以复合炸药的形式使用。纤维素以其优异的相容性和作为绿色天然聚合物的负载能力而广为人知。在本文中，通过使用纤维素作为CL-20颗粒的载体和1-烯丙基-3-甲基咪唑鎓氯化物（AMIMCl）作为纤维素和CL-20的助溶剂，开发了纤维素/ CL-20复合高能气凝胶（CCA）。研究了纤维素再生过程中CL-20的晶体生长规律。结果表明，CCA保持3D网络结构，其中CL-20晶体沿纤维素纤维的延伸方向生长并粘附。进一步来说，纤维素纤维在CL-20晶体和CCA的表面形成致密的膜结构，覆盖率为89.48％。CCAs中CL-20的负载量高达94.4％，并且晶体形式保持不变。由于纤维素膜提供的保护以及CL-20与纤维素之间新的化学键的形成，与原始CL-20相比，CCA的热稳定性，冲击敏感性和摩擦敏感性特性得到了极大的改善。

更新日期：2020-10-07

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