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The role of nitrogen in nitrogen–phosphorus synergism
Author(s) -
Bakoš D.,
Košík M.,
Antoš K.,
Karolyová M.,
Vyskočil I.
Publication year - 1982
Publication title -
fire and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.482
H-Index - 58
eISSN - 1099-1018
pISSN - 0308-0501
DOI - 10.1002/fam.810060104
Subject(s) - flammability , limiting oxygen index , nitrogen , phosphorus , fire retardant , hydrolysis , chemistry , limiting , environmental chemistry , inorganic chemistry , organic chemistry , combustion , engineering , char , mechanical engineering
Thermal analysis and limiting oxygen index flammability tests were used for elucidation of details in phosphorous‐nitrogen synergism in cotton modified with methylol phosphonopropionamide and subsequently hydrolyzed by acid. The results indicate that not all the phosphorus incorporated into the material is effective for flame retardancy purposes in the condensed phase. The comparison of modified and acid hydrolyzed cotton has shown the important influence of nitrogen in the structure of the flame retardant. A simplified theory of nitrogen‐phosphorus synergism, considering this influence, is proposed.