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The role of nitrogen in nitrogen–phosphorus synergism

✍ Scribed by D. Bakoš; M. Košík; K. Antoš; M. Karolyová; I. Vyskočil

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
268 KB
Volume
6
Category
Article
ISSN
0308-0501

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✦ Synopsis

Abstract

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.

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Spin-coupled calculations are carried out for the nitryl halides FNO, and ClNO,. The picture that emerges suggests that the nitrogen atoms use all five valence electrons in covalent bonding. The description of the NO, group appears to be essentially transferable between the two molecules. No evidenc