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Urethane Reaction Mechanism on the Amorphous Boron Surface in GAP propellants
Author(s) -
Oyumi Yoshio,
Nakashita Goro
Publication year - 1992
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19920170604
Subject(s) - propellant , boron , amorphous solid , boric acid , materials science , propane , chemical engineering , boron oxide , impurity , inorganic chemistry , chemistry , organic chemistry , engineering
Thermal analysis and FT‐IR spectrometry were used to characterize the urethane reaction mechanism of polyglycidyl azide (GAP) propellants with powdered amorphous boron. The amorphous boron added GAP propellant with trimethylol propane (TMP) vigorously gassed of during the cure process and did not complete its urethane reaction. Although it was curable by excess amount of isocyanates, voids or bubbles were trapped inside the propellant grain. Since the powdered amorphous boron was relatively hygroscopic compared to other crystalline metal powders, it might contain boron surface impurities, namely, water, boric acid, and/or boron oxide which disturbed the urethane reaction. TMP was also relatively hygroscopic and played an interesting role on the propellant processing, which was used for cross‐link and surface treatment agent of powdered amorphous boron.