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

Abstract

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 majormore » 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.« less

Authors:
;  [1];  [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)
Publication Date:
OSTI Identifier:
5302241
Resource Type:
Journal Article
Journal Name:
Combustion and Flame; (United States)
Additional Journal Information:
Journal Volume: 96:3; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Haas, Y, Eliahu, Y B, and Welner, S. Infrared laser-induced decomposition of GAP. [Glycidyl Azido Polymer]. United States: N. p., 1994. Web. doi:10.1016/0010-2180(94)90010-8.
Haas, Y, Eliahu, Y B, & Welner, S. Infrared laser-induced decomposition of GAP. [Glycidyl Azido Polymer]. United States. https://doi.org/10.1016/0010-2180(94)90010-8
Haas, Y, Eliahu, Y B, and Welner, S. 1994. "Infrared laser-induced decomposition of GAP. [Glycidyl Azido Polymer]". United States. https://doi.org/10.1016/0010-2180(94)90010-8.
@article{osti_5302241,
title = {Infrared laser-induced decomposition of GAP. [Glycidyl Azido Polymer]},
author = {Haas, Y and Eliahu, Y B and Welner, S},
abstractNote = {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.},
doi = {10.1016/0010-2180(94)90010-8},
url = {https://www.osti.gov/biblio/5302241}, journal = {Combustion and Flame; (United States)},
issn = {0010-2180},
number = ,
volume = 96:3,
place = {United States},
year = {Tue Feb 01 00:00:00 EST 1994},
month = {Tue Feb 01 00:00:00 EST 1994}
}