Synthesis, Characterization, Thermal Stability and Sensitivity Properties of New Energetic Polymers—PVTNP-g-GAPs Crosslinked PolymersReportar como inadecuado




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1

State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, China

2

Department of Chemistry, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China

3

Institute of Chemical Materials, Chinese Academy of Engineering Physics, Mianyang 621900, China





*

Authors to whom correspondence should be addressed.



Academic Editor: Frank Wiesbrock

Abstract A series of energetic polymers, polyvinyl 2,4,6-trinitrophenylacetal-g-polyglycidylazides PVTNP-g-GAPs, were synthesized via cross-linking reactions of PVTNP with three different molecular weight GAPs using toluene diisocyanate as the cross-linking agent. The structures of these energetic polymers were characterized by ultraviolet visible spectra UV–Vis, attenuated total reflectance-Fourier transform-infrared spectroscopy ATR-FTIR, and nuclear magnetic resonance spectrometry NMR. The glass-transition temperatures of these energetic polymers were measured with differential scanning calorimetry DSC method, and the results showed that all the measured energetic polymers have two distinct glass-transition temperatures. The thermal decomposition behaviors of these energetic polymers were evaluated by differential thermal analysis DTA, thermogravimetric analysis TGA and thermogravimetric analysis tandem infrared spectrum TGA-IR. The results indicated that all the measured energetic polymers have excellent resistance to thermal decomposition up to 200 °C, and the initial thermal decomposition was attributed to the breakdown of azide group. Moreover, the sensitivity properties of these energetic polymers were measured with the national military standard methods and their compatibilities with the main energetic components of 2,4,6-trinitrotoluene TNT-based melt-cast explosive were evaluated by using the DTA method. The results indicate that these energetic polymers have feasible mechanical sensitivities and can be safely used with TNT, cyclotetramethylene tetranitramine HMX, 1,1-diamino-2,2-dinitroethene FOX-7, 3-nitro-1,2,4-triazol-5-one NTO and 1,3,5-triamino-2,4,6-trinitrobenzene TATB. View Full-Text

Keywords: energetic polymer; polyvinyl 2,4,6-trinitrophenylacetal-g-polyglycidylazides; thermal stability; sensitivity property; compatibility energetic polymer; polyvinyl 2,4,6-trinitrophenylacetal-g-polyglycidylazides; thermal stability; sensitivity property; compatibility





Autor: Bo Jin 1,2,* , Juan Shen 2, Xiaoshuang Gou 2, Rufang Peng 1,* , Shijin Chu 1 and Haishan Dong 3

Fuente: http://mdpi.com/



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