Polyethylene Glycol-Poly(2-Methyl-5-Vinyl Tetrazole) Polymer Blend (A desensitizing Binder for Propellants and Explosives)

Miscible polymer pairs are formed with an energetic polymer, (poly(2- methyl-5-vinyl tetrazole), PMVT,, and a nonenergetic polymer, polyethylene glycol, PEG, of molecular weight 1000 to 4000. This polymer blend PEG-PMVT is formed from acetonitrile solution upon removal of the solvent. The blend also...

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Bibliographic Details
Main Authors: Mishra, Indu B, Kieft, Lawrence V
Format: Report
Language:English
Subjects:
ACETONITRILE
Ammunition and Explosives
BINDERS
CHAINS
DESENSITIZING
ENERGETIC PROPERTIES
EXPLOSIVES
GLASS
GLYCOLS
HEXANES
INFRARED SPECTROSCOPY
METHYL RADICALS
MIXTURES
PE62618A
PLASTIC BONDED EXPLOSIVES
POLYETHYLENE
POLYMERS
POLYPROPYLENE
PRECIPITATES
PROPELLANTS
RDX
REMOVAL
SOLUTIONS(GENERAL)
SOLVENTS
SYMPATHETIC DETONATIONS
TEMPERATURE
TRANSITION TEMPERATURE
TRANSPARENCE
WEIGHT
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Description
Summary:Miscible polymer pairs are formed with an energetic polymer, (poly(2- methyl-5-vinyl tetrazole), PMVT,, and a nonenergetic polymer, polyethylene glycol, PEG, of molecular weight 1000 to 4000. This polymer blend PEG-PMVT is formed from acetonitrile solution upon removal of the solvent. The blend also precipitates when a nonsolvent, hexane, is added to a solution of PEG-PMVT in acetronitrile at or below 0 C. With PEG E1000, blends have been formed with PEG:PMVT of 1:1 to 1:1.8 by weight. This blend has been characterized from its unique glass transition temperature, Tg, as well as formation of transparent films. Interaction between chains in the form of weak C-H..O hydrogen bonding has been identified from infrared spectroscopy. Polymer blends are not formed with PMVT and polypropylene glycol, PPG, with methyl side chains as well as polyols with hydroxy number 3 or more. A blend is formed, however in a narrow regime of temperature with PMVT and glycidylazide polymer, GAP. This polymer blend is found to be a desensitizing energetic binder for propellants and for plastic-bonded explosives in particular. A PBX composition containing 91 percent RDX by weight and 9 percent PEG-PMVT polymer blend has a drop-weight-impact sensitivity better than Comp B. Polyethylene glycol (PEG), Desensitizing binder, Poly(2-methyl-5-vinyl tetrazole) (PMVT), Miscible polymer pairs, Interpenetrating network, Energetic binder, Sympathetic detonation polymer blend.