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Thermoanalytical Investigations on the Effect of Atmospheric Oxygen on HTPB resin
Author(s) -
Ninan K. N.,
Krishnan K.,
Rajeev R.,
Viswanathan G.
Publication year - 1996
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.19960210408
Subject(s) - exothermic reaction , endothermic process , oxygen , nitrogen , polybutadiene , combustion , materials science , exothermic process , pyrolysis , chemistry , depolymerization , analytical chemistry (journal) , polymer chemistry , organic chemistry , composite material , adsorption , copolymer , polymer
TG‐DSC studies, carried out on hydroxy‐terminated polybutadiene (HTPB) in air and nitrogen atmospheres show three transitions which give rise to (1) an exothermic DSC peak and mass gain in TG at 170°C–240°C, seen only in air (2) exothermic peak and low mass loss, both in air and nitrogen, due to depolymerization, cyclization and cross linking, and (3) final mass loss corresponding to pyrolysis in nitrogen and combustion in air, appearing respectively as an endothermic peak and as a sharp exothermic peak in the two atmospheres. The FTIR spectrum of the product isolated from TG after the mass gain step shows addition of oxygen to the butadiene back bone. Arrhenius activation parameters (E and A) were computed for the exothermic oxygen addition reaction. The Ozawa method refined by MKN two‐term approximation for p(x) function gave results quite comparable to those from Kissinger method.