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Some theoretical aspects of bromine‐containing triazine flame retardants
Author(s) -
Chance Leon H.
Publication year - 1981
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1981.070260912
Subject(s) - bromine , thermogravimetric analysis , char , flammability , cellulose , fire retardant , materials science , decomposition , thermal decomposition , polymer chemistry , organic chemistry , pyrolysis , chemistry
We studied flame retardancy of cotton fabric treated with five diaminotriazines containing bromine—three compounds with the bromine on aliphatic groups and two with the bromine on phenyl groups. Flame retardancy, as measured by oxygen index and FF3‐71 flammability standards, was better on the fabrics containing aliphatic bromine than on the fabrics containing aromatic bromine. Thermogravimetric analyses (TGA) and differential thermogravimetric analyses (DTG) were obtained on the fabrics, results of which supported the theory that HBr liberated during burning lowers the ignition temperature and decomposition point of the cellulose causing a reduction in flammable gases and an increase in residual char. Since CH and CBr bond strengths are stronger on aromatic groups than on aliphatic groups, our results agree with the theory that flame retardancy increases as the CBr bond strength decreases. In other words, since bromine inhibits oxidation reactions in the gas phases, the heat evolved is expected to become less as the CBr bond strength decreases.