Constructing Porous Energetic Spherulites via Solvation-Growth Coupling for Enhanced Combustion.

Autor: Li M; State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.; Collaborative Innovation Center of Chemistry and Chemical Engineering, Tianjin, 300072, P. R. China.; Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang, Sichuan, 621900, P. R. China., Zhou X; Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang, Sichuan, 621900, P. R. China., Han D; State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.; Collaborative Innovation Center of Chemistry and Chemical Engineering, Tianjin, 300072, P. R. China., Zhang Q; Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang, Sichuan, 621900, P. R. China., Li X; Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang, Sichuan, 621900, P. R. China., Li H; Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang, Sichuan, 621900, P. R. China., Gong J; State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.; Collaborative Innovation Center of Chemistry and Chemical Engineering, Tianjin, 300072, P. R. China.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Oct; Vol. 20 (40), pp. e2400970. Date of Electronic Publication: 2024 May 27.
DOI: 10.1002/smll.202400970
Abstrakt: The fabrication of materials with hierarchical structures has garnered great interest, owing to the potential for significantly enhancing their functions. Herein, a strategy of coupling molecular solvation and crystal growth is presented to fabricate porous spherulites of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20), an important energetic material. With the addition of polyvinylpyrrolidone in the antisolvent crystallization, the metastable solvate of CL-20 is formed and grows spherulitically, and spontaneously desolvates to obtain the porous spherulite when filtration, in which the characteristic peak of the nitro group of CL-20 shifts detected by the in situ micro-confocal Raman spectroscopy. The effect of polyvinylpyrrolidone is thought to induce the solvation of CL-20, confirmed by density functional theory calculations, meanwhile acting on the (020) face of CL-20 to trigger spherulitic growth, demonstrated through infrared spectroscopy and Rietveld refinement of powder X-ray diffraction. Moreover, compared to common CL-20 crystals, porous spherulites exhibit enhanced combustion with increases of 6.24% in peak pressure, 40.21% in pressurization rate, and 9.63% in pressure duration effect, indicating the capability of hierarchical structures to boost the energy release of energetic crystals. This work demonstrates a new route via solvation-growth coupling to construct hierarchical structures for organic crystals and provides insight into the structure-property relations for material design.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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