▎ 摘　　要

NOVELTY - Preparing nano-hybrid multifunctional polyurethane flame-retardant material comprises (i) converting the carboxy groups on the graphene oxide into acid chloride groups to obtain chlorinated graphene oxide (Cl-GO), reacting Cl-GO with primary amine reagents to convert the acid chloride groups into amide groups to obtain nitrogen-modified graphene oxide (A-GO), (ii) reacting vanadium pentoxide and diphenylamine by in-situ chemical oxidation polymerization to obtain poly diphenylamine-coated vanadium pentoxide (P-V2O5), and (iii) adding A-GO and poly diphenylamine-coated vanadium pentoxide in to the polyurethane (PU), heating and stirring the reaction, cooling and drying to obtain dual-nano hybrid multifunctional polyurethane composite material (mf-PUC). USE - The method is useful for preparing nano-hybrid multifunctional polyurethane flame-retardant material. ADVANTAGE - The method compounds and hybridizes functionalized graphene oxide modified by nitrogen and vanadium pentoxide and degradable shape memory polyurethane by double-nano particles, has functions e.g. degradability, shape memory, corrosion resistance and flame retardancy, and has great potential in the fields of biological material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for nano-hybrid multifunctional polyurethane flame retardant material, comprising nitrogen-modified graphene oxide, poly diphenylamine-coated vanadium pentoxide and polyurethane, where the total mass fraction of A-GO and P-V2O5 is 0.5-2%, and the mass fraction of PU is 98-99.5%.