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Tailoring the irreversible thermal expansion of 1,3,5‐triamino‐2,4,6‐trinitrobenzene crystals by bioinspired polydopamine coating
Author(s) -
Lin Congmei,
Cheng Bibo,
Zhang Haobin,
Gong Feiyan,
Yang Zhijian,
Liu Shijun,
Li Jiang,
Guo Shaoyun
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48695
Subject(s) - tatb , materials science , thermal expansion , coating , composite material , polymerization , thermal stability , aqueous solution , chemical engineering , polymer chemistry , explosive material , chemistry , polymer , organic chemistry , detonation , engineering
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 °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 °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. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 137 , 48695.