Accession Number : ADA137363

Title :   Thermoplastic Elastomers as LOVA (Low Vulnerability Ammunition) Binders.

Descriptive Note : Annual technical rept.,


Personal Author(s) : Chien,J C W

PDF Url : ADA137363

Report Date : 01 Dec 1983

Pagination or Media Count : 79

Abstract : The project seeks to synthesize and test polymers for application as binders in ammunition charges such that the vulnerability of the explosive to premature or extraneous detonation will be lowered (Low Vulnerability Ammunition = LOVA). The desired properties for such a binder are: Low Tg ( -60 deg. C); Moderate stress at 400% strain; Long term oxidative stability (up to 80 deg. C); Bonding to cyclic nitramine pellets; High density ( 1.15); Endothermic decomposition (200 - 250 deg. C), and Acid or thermal initiated endothermic decomposition (200 - 250 deg. C). The latter two properties are special aspects of LOVA binders. The University of Massachusetts effort aims at synthesis, mechanical testing, and processing aspects of development of an optimal LOVA binder. The primary approach is to synthesize thermoplastic elastomers (TPE). These are elastomeric by virtue of the soft blocks being crosslinked by crystalline hard blocks. Melting the hard block renders the polymer processible, but reformation of the crosslinks at ambient temperature restores elasticity. Synthesis of a variety of TPE's with hard and soft segments of a range of lengths and identities, adjustments of synthesis based on extensive mechanical tests, and development processing procedures for the highly filled TPE's constitutes the project. The desire is to converge on the above listed properties. (Author)

Descriptors :   *Elastomers, *Thermoplastic resins, *Binders, *Ammunition, Vulnerability, Low level, Polymers, Explosive charges, Synthesis, Endothermic reactions, High density, Mechanical properties, Test methods, Detonations, Thermal properties, Crosslinking(Chemistry), Stability

Subject Categories : Miscellaneous Materials
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE