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首页> 外文期刊>Journal of Applied Polymer Science >Tailoring the irreversible thermal expansion of 1,3,5-triamino-2,4,6-trinitrobenzene crystals by bioinspired polydopamine coating
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Tailoring the irreversible thermal expansion of 1,3,5-triamino-2,4,6-trinitrobenzene crystals by bioinspired polydopamine coating

机译：通过BioInspired多Dadopamine涂层剪裁1,3,5-颗粒-2,4,6-三硝基苯晶体的不可逆热膨胀

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摘要

Bioinspired polydopamine (PDA) was selected for the fabrication of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB)-based microcapsules to improve the thermal stability via a facile in situ polymerization of dopamine on the surface of explosive crystals in a weak alkaline aqueous solution. The effects of experimental conditions, including TATB core size, PDA shell content, elevated-temperature hold time, hold temperature, and test stress on the irreversible thermal expansion of TATB crystals, were comprehensively and comparatively studied. After coating, the strain change at each cooling and heating stage in a thermal cycling test from -54 to 74 degrees C visibly decreased, attributing to the fact that the highly crosslinked and dense PDA shell acted as a rigid pressure vessel to constrain the expansion of energetic crystals. The irreversible expansion strain at room temperature after a 23-113 degrees C cycle decreased with the increasing of PDA shell thickness. Compared with raw fine grains TATB (FTATB) crystals, FTATB enabled in 1.5 wt % PDA showed a dramatically drop in the irreversible expansion strain at room temperature by 27.7% (from 0.520 to 0.376%). The results demonstrated the excellent ability of PDA to alleviate irreversible thermal expansion of anisotropic energetic crystals. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48695.
机译：选择生物悬浮的聚德米胺（PDA）用于制备1,3,5-葡胺-2,4,6-三硝基苯（TATB）的微胶囊，以通过在爆炸性表面上通过体内聚合的体内稳定性来改善热稳定性晶体水溶液中的晶体。实验条件的影响，包括TATB核心尺寸，PDA壳含量，升高温度保持时间，保持温度和测试应力对TATB晶体不可逆的热膨胀，并进行了较高的研究。在涂覆后，从-54至74摄氏度的热循环试验中的每个冷却和加热阶段的应变变化明显降低，归因于高度交联和致密的PDA壳作为刚性压力容器来限制膨胀的事实精力充沛的水晶。在23-113摄氏度循环后室温下的不可逆膨胀应变随着PDA壳厚度的增加而降低。与原料颗粒TATB（FTATB）晶体相比，1.5wt％PDA的FTATB在室温下在不可逆的膨胀应变中逐渐下降27.7％（0.520至0.376％）。结果表明PDA减轻各向异性能量晶体不可逆热膨胀的优异能力。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48695。

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