Abstract
Nitrate glycerol ether cellulose (NGEC) is a potential cellulose substitute for the substrate of gun propellants in the future, but interfacial compatibility with high energy solid filler has remained an ongoing challenge. In this study, NGEC, modified with polydopamine (PDA), were prepared with various reaction time, to obtain composite energetic cellulose core-shell materials with improved hydrophilic and adiabatic safety by combining advantage of self-polymerization of dopamine (DA). The composition, distribution, and hydrophilicity of the molecular groups of the composite energetic cellulose were evaluated, as well as the thermodynamic behavior and safety properties in the adiabatic environment. Results demonstrated that the structure of NGEC remained unchanged when PDA formed dense nanofilm on the surface of NGEC, and the introduction of hydroxyl group in PDA significantly improved the hydrophilicity of NGEC by WCA analysis. Most notably, according to DSC and TGA data, after applying PDA coating, both the activation energy (Ea) and weight loss ratio (Wr) of high-energy cellulose showed a slight decrease. Specifically, the Ea of NGEC@PDA-6 h was very similar to that of NGEC and showed the lowest Wr. The PDA coating might also substantially increase the initial temperature and pressure of the adiabatic decomposition of the NGEC by the ARC results. In summary, without altering the intrinsic properties of the NGEC, PDA could increase the safety properties of the adiabatic environment, providing a method for hydrophilic modification of the energetic cellulose surfaces.
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Acknowledgments
The authors are indebted to Dr. Weidong He and Dr. Ling Chen for technical suggestions on experiments and analyses of NGEC thermal properties. This work thanks to the supporting of Jiangsu Funding Program for Excellent Postdoctoral Talent, and Project funded by China Postdoctoral Science Foundation (2023TQ0158) In addition, the authors thank Shiyanjia Lab (www.shiyanjia.com) for the support of XPS and WCA test.
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QL and BW are co-first authors of the article. QL wrote the main manuscript text. BW and JH, LC and WH provided some test method. All authors reviewed the manuscript.
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Li, Q., Wang, B., Huang, J. et al. Biomimetic modification strategy of nitrate glycerol ether cellulose with polydopamine and its thermal decomposition behavior. Cellulose 31, 217–233 (2024). https://doi.org/10.1007/s10570-023-05656-0
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DOI: https://doi.org/10.1007/s10570-023-05656-0