Infrared laser-induced decomposition of GAP. [Glycidyl Azido Polymer]

Journal Article · Tue Feb 01 00:00:00 EST 1994 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(94)90010-8· OSTI ID:5302241

Haas, Y; Eliahu, Y B ^[1]; Welner, S ^[2]

---

1. Hebrew Univ. of Jerusalem (Israel). Dept. of Physical Chemistry and the Farkas Center for Light Induced Processes
2. Armament Development Authority, Haifa (Israel)

The laser-induced decomposition of a solid azido polymer (GAP) is reported. A TEA CO[sub 2] laser (tunable in the 920--1,080 cm[sup [minus]1] range) is used and the dissociation yield is shown to correlate with the one photon absorption spectrum, although about 15 photons per molecule are required to break the weakest bond. At high laser fluence, complete decomposition of the whole sample can be affected using a single laser pulse, leading mostly to gaseous products. When irradiated under vacuum using medium laser fluence (up to 5 J/cm[sup 2]), only a small fraction of the polymer dissociates and the main gaseous products are N[sub 2], Co, C[sub 2]H[sub 4], HCN, and probably H[sub 2]. Many other products are formed in much lesser yields, but two compounds-formaldehyde and ammonia--that have been reported as major products upon thermal decomposition, are absent. In addition a powdery polymeric material containing a [minus]CH=NH group is formed. The overall yield is roughly proportional to the laser pulse energy in the range 30--150 mJ (corresponding to about 1--5 J/cm[sup 2]). Addition of helium or oxygen leads to a dramatic reduction in the HCN relative yield and a smaller reduction of acetylene yield with little change in other major products yields and to the formation of a sticky amber colored polymer. The results are consistent with the initial rupture of a N-N[sub 2] bond of the azido group, followed by creation of reactive species that lead to the formation of the solid polymer and the final gaseous products. The effect of added gases is presumably cooling of these primary reactive species.

• OSTI ID: 5302241
• Journal Information: Combustion and Flame; (United States), Vol. 96:3; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AZIDO COMPOUNDS
COMBUSTION KINETICS
DECOMPOSITION
PROPELLANTS
CARBON MONOXIDE
CHEMICAL REACTION YIELD
COMBUSTION PRODUCTS
ETHYLENE
HYDROCYANIC ACID
HYDROGEN
INFRARED RADIATION
LASER RADIATION
NITROGEN
ALKENES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CYANIDES
ELECTROMAGNETIC RADIATION
ELEMENTS
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
REACTION KINETICS
YIELDS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry