Accession Number : ADA269056


Title :   Strained Ring Energetic Binders


Descriptive Note : Final rept. Nov 1990-Aug 1993


Corporate Author : THIOKOL CORP BRIGHAM CITY UT


Personal Author(s) : Cannizzo, Louis F. ; Grubbs, Robert .H. ; Hillmyer, Marc A. ; Schaller, Jean-Pierre


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA269056


Report Date : 27 AUG 1993


Pagination or Media Count : 35


Abstract : The use of thermoplastic elastomers (TPEs) containing strained hydrocarbon rings as energetic propellant binders is an attractive approach to increasing the performance of highly oxidized propellant formulations which currently use HTPB as a binder. The recently reported strained-ring elastomeric polymer polybenzvalene (PBV), produced by ring-opening metathesis polymerization (ROMP), is an example of a strained ring polymer. However, PBV is thermally unstable (T(sub onset) = 77 deg C, T(sub max)= 137 deg C) and deflagrates under severe mechanical stretching. In this program several areas were investigated. First, studies to attempt the thermal stabilization of PBV were undertaken. One approach was the partial reduction of the double bonds present in PBV which gave only small increases in thermal stability (Delta T(sub max) = 9 deg C). The second approach was the addition of radical traps to PBV which, again, gave only small increases in thermal stability (delta T(sub max) = 8 deg C). The second area investigated a different strained ring polymer, polyhomobenzvalene (PHBV). PHBV was not found to have the mechanical instability problems of PBV, but was still thermally unstable (T(sub onset) = 66 deg C, T(sub max) = 109 deg C). The last area studied was the application of acyclic olefins as chain-transfer agents during polymer formation which produced difunctional hydroxytelechelic polymers of cyclooctene and cyclooctadiene (as model systems) with good control of molecular weight.


Descriptors :   *PROPELLANTS , *BINDERS , *ENERGETIC PROPERTIES , STABILIZATION , CONTROL , MODELS , POLYMERS , POLYMERIZATION , CHEMICAL BONDS , HYDROCARBONS , TRANSFER , HYDROXY TERMINATED POLYBUTADIENE , TRAPS , OPENINGS , INSTABILITY , RINGS , THERMOPLASTIC RESINS , OXIDATION , FORMULATIONS , MOLECULAR WEIGHT , ELASTOMERS , THERMAL STABILITY , REDUCTION


Subject Categories : POLYMER CHEMISTRY
      ELASTOMERS AND RUBBER
      AMMUNITION AND EXPLOSIVES
      ROCKET PROPELLANTS


Distribution Statement : APPROVED FOR PUBLIC RELEASE