Thermal decomposition of bamo/ammo copolymer

Y. J. Lee, G. Kudva, Thomas Litzinger

Research output: Contribution to conferencePaper

Abstract

Measurements of gaseous species and temperature profiles were performed to study the thermal decomposition of the copolymer of 3,3’-bis-azidomethyl-oxetane (BAMO) and 3-azidomethyl-3-methyloxetane (AMMO). Experiments were conducted at 1 ATM of argon with heat fluxes of 100 and 400 W/cm2 delivered by a CO2 laser. Gaseous samples were extracted through the use of a quartz microprobe and analyzed by a triple quadrupole mass spectrometer (TQMS). Temperature profiles were measured using the micro-thermocouple technique to investigate gas-phase reaction zones identified by the species measurements. Flame structure and surface behavior were observed using a high-magnification video system. Major species evolved from the surface were identified to be N2, H2CO, HCN, NH2, H2O, CO, CH2CNH, and C2H2. Minor species include NO, CH2, H2, CH2CHNH (m/z=43), CH3CHO (44), CO2, H2CNH (29), C2H2, and CH2. From the species measurements at both heat flux conditions, BAMOIAMMO was found to undergo simultaneous decomposition of its backbone structure, indicated by the release of high concentrations of H2CO, H2O, and CO, and of side chains, by the large amounts of N2, HCN, and some hydrocarbon molecules. No gasphase reaction was identified, since most of the major species measured exhibited relatively constant concentrations in the gas-phase. The lack of a gasphase reaction was also evident from the gas-phase temperature profile that showed a relatively constant value of 800-900 K and 850-950 K at 100 and 400 W/cm2, respectively. The effect of AMMO on the thermal decomposition of BAMO/AMMO was identified by the changes of mole fractions of some major species, surface and gas-phase temperatures, and burning rates relative to results for pure BAMO.

Original languageEnglish (US)
StatePublished - Jan 1 1999
Event35th Joint Propulsion Conference and Exhibit, 1999 - Los Angeles, United States
Duration: Jun 20 1999Jun 24 1999

Other

Other35th Joint Propulsion Conference and Exhibit, 1999
CountryUnited States
CityLos Angeles
Period6/20/996/24/99

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Control and Systems Engineering
  • Aerospace Engineering

Cite this

Lee, Y. J., Kudva, G., & Litzinger, T. (1999). Thermal decomposition of bamo/ammo copolymer. Paper presented at 35th Joint Propulsion Conference and Exhibit, 1999, Los Angeles, United States.