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Dynamic mechanical signatures of Viton A and plastic bonded explosives based on this polymer
Author(s) -
Mark Hoffman D.
Publication year - 2003
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10012
Subject(s) - materials science , explosive material , composite material , relaxation (psychology) , glass transition , shear modulus , polymer , dynamic mechanical analysis , polymer chemistry , chemistry , organic chemistry , psychology , social psychology
The complex shear moduli of the fluorelastomer Viton A and four plastic bonded explosives LX‐04, LX‐07, LX‐10, and LX‐11, which use this polymer as a binder, have been investigated. LX‐10, LX‐07, LX‐04 and LX‐11 are composites of 94.5, 90, 85 and 80% 1, 3, 5, 7‐tetranitroazacyclooctane (HMX) explosive, respectively, and Viton A. Viton is a random copolymer of 7 vinylidene fluoride and 2 perfluoropropene monomers. In the temperature range from −150 to 120°C, two relaxations, the β relaxation at −80°C and the glass transition at −22°C, were observed as peaks in the loss modulus in Viton A at 0.1 Hz. A third relaxation, T α , was found above T g in all four explosive formulations. The plastic bonded explosives (PBX's) showed antiplasticization phenomena. T g of the explosives increased 2–3°C as the concentration of binder was reduced in 5% steps. Samples from the same original lot of LX‐04 were evaluated after 20–23 years of service. The alpha relaxation occurred at 60°C as a peak in the loss modulus at 1 Hz. Both the beta and alpha relaxations were very broad and an accurate maximum for these relaxations was difficult to determine.