▎ 摘　　要

The improvement of flame retardants in controlling polymer combustion behavior is mainly based on their effect on the polymer thermal degradation behavior. In this article, the Kissinger method and Flynn-Wall-Ozawa method were used to study the thermal degradation behavior of alginate (Alg)/graphene composite fibers. The results of activation energy calculated by the two methods were very consistent. The addition of a graphene-based flame retardant (GO-DOPO-V, where GO represents graphene oxide, DOPO represents 9,10-dihydro-9-oxy-10-phosphoxanthine-10-oxide and V represents vinyltrimethoxysilane) increased the thermal degradation activation energy of the Alg composite fiber and enhanced the thermal stability and flame retardancy of the fiber. The Flynn-Wall-Ozawa method further revealed that the addition of GO-DOPO-V induced a condensation reaction of the polymer at the early degradation stage of the Alg composite fibers, leading to a decrease in the thermal degradation activation energy. At the final stage of the thermal degradation, with the formation of a char layer, the thermal degradation and activation energy of the Alg composite fibers were improved under the action of GO-DOPO-V, and the flame retardancy of the Alg composite fibers was enhanced.