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Hexamethoxycyclotriphosphazene as a flame retardant for polyurethane foams

: Käbisch, B.; Fehrenbacher, U.; Kroke, E.


Fire and Materials : FAM 38 (2014), Nr.4, S.462-473
ISSN: 0308-0501
ISSN: 1099-1018
Fraunhofer ICT ()

Polyurethane (PU) foams were protected by phosphorous and nitrogen-based molecular flame retardant hexamethoxycyclotriphosphazene c-[N=P(OMe)2]3 (HMCPT). This compound was synthesized, analyzed, and investigated with respect to its thermal behavior, compatibility, and efficiency as a flame retardant (FR) for PU foams. The decomposition of HMCPT starts at 186°C in air and under argon, as indicated by TG/DSC measurements. It was possible to introduce 5 per hundred parts polyol (phpp) of HMCPT into the PU foams. The mechanical and morphological characteristics of the protected foams-compression load deflection, tenacity, tensile elongation, air perviousness, and raw density-were investigated indicating that the FR has an impact on all of these properties. The flame retardancy was evaluated with the FM VSS 302 test, where an self-extinguishing classification was reached with 5phpp of HMCPT. Cone calorimeter measurements provide evidence for a flame poisoning mechanism.