Novel P-N Bonded Flame Retardants

摘要

There has always been a strong interest in flame retardant community in developing P-N bonded structures. Their excellent flame retardant properties have been attributed to P-N synergism phenomena. Most of these P-N bonded structures like phosphoramidates have been shown to have condensed phase action. We have recently developed novel P-N bonded structures (Phosphonamidates) derived from 9, 10-Dihydro-9-Oxa-10-Phosphaphenanthrene-10-Oxide (DOPO). Phosphonamidates of varying thermal stability were prepared by varying the substituents on the amino group. These phosphonamidates have been shown to primarily exhibit gas-phase flame inhibition. This presentation will focus on the synthesis, evaluation of thermal properties and fire retardant applications of these novel phosphonamidate compounds as flame retardants in flexible polyurethane foams and other polymers.