Bicyclic compounds containing phosphorus on their skeleton such as 2,4,6-trioxa-1-phosphabicyclo[2,2,2]octane-4-methanol phosphate (PEPA) having three active ingredients required for intumescence have been synthesized. The structural characterization of PEPA was carried out by FT-IR, 1H and 13C NMR. The thermal behaviour of the material was studied using TGA, TGA–MS and pyrolysis GC–MS. Thermogravimetric analysis reveals that PEPA undergoes several stages of degradation with a char of about 12% at 800 °C. The TGA–MS studies indicate that the material degrades with the liberation of water, formaldehyde, alkene and alcohols as the major degradation products. Pyrolysis GC–MS results reveal that PEPA isomerizes in the acidic medium. PEPA and/or isomers of PEPA react with formaldehyde, one of the degradation products, to form cross-linked structure and cyclic products with the elimination of water molecule. The thermal degradation mechanisms for PEPA are presented and discussed.
1. Mostashari, SM, Mostashari, SZ2008Combustion pathway of cotton fabrics treated by ammonium sulfate as a flame retardant studied by TG. J Therm Anal Calorim91:437–447.
Hernangil, A, Rodriguez, M, Leon, LM, Ballestero, J, Alonso, JR1999Experimental design of fire-retarded formulation. Low viscosity polyester resins. J Fire Sci17:281–30610.1177/073490419901700403.)| false
4. Atikler, U, Demir, H, Tokatli, F, Tihminlioğlu, F, Balköse, D, Ülkü, S2006Optimisation of the effect of colemanite as a new synergistic agent in an intumescent system. Polym Degrad Stab91:1563–1570.
Atikler, U, Demir, H, Tokatli, F, Tihminlioğlu, F, Balköse, D, Ülkü, S2006Optimisation of the effect of colemanite as a new synergistic agent in an intumescent system. Polym Degrad Stab91:1563–157010.1016/j.polymdegradstab.2005.09.017.)| false
Huang, Z-G, Shi, W-F2007Effect of poly(bisphenol A acryloxyethyl phosphate) on the activation energy in thermal degradation of urethane acrylate. J Therm Anal Calorim88:833–84110.1007/s10973-006-7552-z.)| false
Fontaine, G, Bourbigot, S, Duquesne, S2008Neutralized flame retardant phosphorus agent: facile synthesis, reaction to fire in PP and synergy with zinc borate. Polym Degrad Stab93:68–7610.1016/j.polymdegradstab.2007.10.019.)| false
20. Gao, F, Tong, L, Fang, Z2006Effect of novel phosphorus-nitrogen containing intumescent flame retardant on the fire retardancy and thermal behaviour of poly(butylene terephthalate). Polym Degrad Stab91:1295–1299.
Gao, F, Tong, L, Fang, Z2006Effect of novel phosphorus-nitrogen containing intumescent flame retardant on the fire retardancy and thermal behaviour of poly(butylene terephthalate). Polym Degrad Stab91:1295–129910.1016/j.polymdegradstab.2005.08.013.)| false
Song, P, Fang, Z, Tong, L, Jin, Y, Lu, F2008Effect of metal chelate on a novel oligomeric intumescent flame retardant system for polypropylene. J Anal Appl Pyroysis82:286–29110.1016/j.jaap.2008.04.008.)| false
Harashina, H, Tajima, Y, Itch, T2006Synergistic effect of red phosphorus, novalac and melamine ternary combination on flame retardancy of poly(oxy methylene). Polym Degrad Stab91:1996–200210.1016/j.polymdegradstab.2006.02.010.)| false