Thermal decomposition study of 5,5,5′,5′,5″,5″-hexamethyltris(1,3,2-dioxaphosphorinanemethan)amine 2,2′,2″-trioxide and its mixtures with melamine phosphate

✍ Scribed by A.I. Balabanovich; V.P. Prokopovich

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 468 KB
• Volume: 76
• Category: Article
• ISSN: 0165-2370
• DOI: 10.1016/j.jaap.2005.10.006

✦ Synopsis

This paper deals with the thermal decomposition behavior of 5,5,5 0 ,5 0 ,5 00 ,5 00 -hexamethyltris(1,3,2-dioxaphosphorinanemethan)amine 2,2 0 ,2 00trioxide (I), a fire retardant additive, and its mixtures with melamine phosphate. Under nitrogen, (I) exhibits melting followed by an exothermal weight loss process at 260-340 8C. Under air, the temperature of the weight loss process is lowered by about 30 8C. The main volatile pyrolysis products of (I) are 2-methyl-1,3-butadiene, 2-methylbutanal and 5,5-dimethyl-1,3,2-dioxaphosphorinane 2-oxide. Condensed phosphoric acids are accumulated in the solid pyrolysis products. Addition of melamine phosphate decreases the thermal stability of (I) causing its rapid dealkylation followed by the formation of melamine oligophosphates and decomposition of the symm-triazine ring. The structure of the charred products depends on the ratio of the initial components. The main products from pyrolysis of the (I) + melamine phosphate = 1:1 or 2:1 mixtures are crosslinked urea derivatives and imidophosphoric acids.