TY - JOUR
T1 - Thermal decomposition of BAMO/AMMO with and without TiO2
AU - Lee, Young Joo
AU - Litzinger, Thomas A.
N1 - Funding Information:
The authors are deeply indebted to Dr. Richard Miller, whose sustained support allowed the facility used in this study to be created and whose technical vision led to the work presented in this paper. This research was supported partly by The Pennsylvania State University and partly by the California Institute of Technology Multidisciplinary University Research Initiative under ONR Grant No. N00014-95-1-1338, Program Manager Dr. Judah Goldwasser.
PY - 2002/2/25
Y1 - 2002/2/25
N2 - An experimental study of 3,3′-bis(azidomethyl) oxetane/3-azidomethyl-3-methyloxetane (BAMO/AMMO) and BAMO/AMMO/TiO2 was performed to investigate thermal decomposition of the copolymer and the effect of TiO2 on its decomposition. Experiments were conducted at 0.1 MPa with heat fluxes of 100 and 400 W/cm2, delivered by a CO2 laser. Gaseous samples were extracted by quartz microprobes and analyzed in a triple quadrupole mass spectrometer (TQMS). Gas-phase temperature profiles and surface temperatures were measured using the micro-thermocouple technique to investigate gas-phase reaction zones identified by the species measurement. Species measurements revealed that decomposition products of BAMO/AMMO were quite similar to those reported for BAMO and that the addition of TiO2 caused no significant changes in mole fractions of the products, except for an increase in NH3. Product species were indicative of simultaneous decomposition of the backbone structure and side chains. No evidence of gas-phase reaction was found in gas-phase species or temperature profiles, indicating that the reactions are occurring in the condensed-phase or in a near-surface reaction zone. The regression rate was substantially reduced by the addition of TiO2 at a heat flux of 400 W/cm2. Based upon the species and temperature measurements, it is argued that this reduction is primarily a result of physical, rather than chemical, effects of the TiO2.
AB - An experimental study of 3,3′-bis(azidomethyl) oxetane/3-azidomethyl-3-methyloxetane (BAMO/AMMO) and BAMO/AMMO/TiO2 was performed to investigate thermal decomposition of the copolymer and the effect of TiO2 on its decomposition. Experiments were conducted at 0.1 MPa with heat fluxes of 100 and 400 W/cm2, delivered by a CO2 laser. Gaseous samples were extracted by quartz microprobes and analyzed in a triple quadrupole mass spectrometer (TQMS). Gas-phase temperature profiles and surface temperatures were measured using the micro-thermocouple technique to investigate gas-phase reaction zones identified by the species measurement. Species measurements revealed that decomposition products of BAMO/AMMO were quite similar to those reported for BAMO and that the addition of TiO2 caused no significant changes in mole fractions of the products, except for an increase in NH3. Product species were indicative of simultaneous decomposition of the backbone structure and side chains. No evidence of gas-phase reaction was found in gas-phase species or temperature profiles, indicating that the reactions are occurring in the condensed-phase or in a near-surface reaction zone. The regression rate was substantially reduced by the addition of TiO2 at a heat flux of 400 W/cm2. Based upon the species and temperature measurements, it is argued that this reduction is primarily a result of physical, rather than chemical, effects of the TiO2.
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U2 - 10.1016/S0040-6031(01)00785-7
DO - 10.1016/S0040-6031(01)00785-7
M3 - Article
AN - SCOPUS:0037170266
SN - 0040-6031
VL - 384
SP - 121
EP - 135
JO - Thermochimica Acta
JF - Thermochimica Acta
IS - 1-2
ER -