Intumescent flame retardantFire-retardant propertiesPyrolysis behaviorThermal behaviorElectron beam irradiationINTUMESCENT FLAME-RETARDANTMODIFIED AMMONIUM POLYPHOSPHATEIRRADIATION CROSS-LINKINGPHOSPHORUS OXYCHLORIDESURFACE MODIFICATIONCHARRING AGENTCOPOLYMERDEGRADATIONPHOSPHORYLATIONETHANOLAMINE