Synthesis, Characterization and Properties of Nitropolybutadiene as Energetic Plasticizer for NHTPB Binder

The nitration of low molecular weight polybutadiene (PB) by a convenient and inexpensive procedure was investigated. To retain the unique physico‐chemical properties of the plasticizer, it was nitrated to an extent of 10 % double bonds. The product nitropolybutadiene (NPB) was characterized by FT‐IR...

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Published in:Propellants, explosives, pyrotechnics explosives, pyrotechnics, 2017-03, Vol.42 (3), p.269-275
Main Authors: Ashrafi, Mahdi, Fakhraian, Hossein, Dehnavi, Mohammad Ali
Format: Article
Language:English
Subjects:
Binders
Efficiency
Energetic polymer plasticizer
Explosive bonding
Explosives
Exudation
Glass transition temperature
Kinetic parameters
Nitropolybutadiene (NPB)
Plasticizer efficiency
Plasticizers
Polybutadienes
Pyrotechnics
Thermogravimetric analysis
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Summary:The nitration of low molecular weight polybutadiene (PB) by a convenient and inexpensive procedure was investigated. To retain the unique physico‐chemical properties of the plasticizer, it was nitrated to an extent of 10 % double bonds. The product nitropolybutadiene (NPB) was characterized by FT‐IR and 1H NMR spectroscopy as well as GPC, DSC, and TGA methods. The kinetic parameters for the decomposition of NPB from room temperature to 400 °C were obtained from non‐isothermal DSC. The changes in glass transition temperature (Tg) and inert uncured binder systems were used for determination of its efficiency as plasticizer. NPB was used in cured and unfilled nitro‐hydroxyl terminated polybutadiene (NHTPB) binder. Isothermal thermogravimetric analysis (Iso‐TGA) was employed to determine the migration rate in cured and unfilled HTPB binder systems compared to the dioctyladiphate (DOA) plasticizer. It was found that the exudation of the NPB plasticizer is slower than that of the DOA plasticizer. Thus, the NHTPB/NPB binder system (binder/plasticizer) presents more convenient mechanical properties than HTPB/DOA and is a promising new energetic binder system for polymer bonded explosives.
ISSN:0721-3115
1521-4087
DOI:10.1002/prep.201600057