Journal of Advances in Nanomaterials

Download PDF (3193.3 KB) PP. 1 - 13 Pub. Date: June 1, 2020

DOI: 10.22606/jan.2020.51001

• Xiaolan Song^*
  School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
• Chenli Liu
  School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
• Yi Wang
  School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
• Zhipeng Cheng
  School of Chemistry & Chemical Engineering, Huaiyin Normal University, Huaian 223300, China
• Fengsheng Li
  School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

A large number of studies have shown that there are two main methods for the hygroscopicity of ammonium nitrate (AN). One is spheroidization and the other is coating modification. In this study, numerical simulation is first performed and then spherical AN is prepared and modified by coating. In theoretical simulation section, the binding energy of Polystyrene (PS), Polymethylmethacrylate (PMMA), Polyvinyl Chloride, and Nitrocellulose (NC) and explosive AN were simulated using Materials Studio software. In the experimental part, ultrafine AN is obtained by mechanical ball milling, then the surface of the refined AN is coated with a certain mass fraction of these four kinds polymerA certain amount of Diglycerol Tetranitrate (DGTN) is added during the coating to increase the plasticity and film formation of the polymer. The raw material AN and the four polymer-coated AN samples were subjected to microscopic morphology and particle size analysis (SEM), thermal decomposition characteristics analysis (DSC), X-ray powder diffraction analysis (XRD), infrared spectroscopy (IR), and moisture absorption test. The results show that the binding energy between the four materials and AN is in order: PMMA>PVC>NC>PS. The refined AN particle diameter obtained by mechanical ball milling is lower than 5 micrometers, which is ellipsoidal and does not change the crystal form of AN. The four coating materials are effectively coated with AN’s surface, and the AN is not changed before and after coating about crystal structure. The effect of the four coating materials on the AN hygroscopicity is: NC>PVC>PMMA>PS. The AN moisture absorption rate after coating with PS, PMMA, PVC, and NC decreased by 11.11%, 21.48%, 45.94%, and 46.91%, respectively, compared with the moisture absorption rate of the raw material AN.

AN, DGTN, polymers, surface coating, hygroscopicity

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