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ABSTRACT A promising route is established to produce a liquefied cellulose‐based epoxy resin via phenol‐catalyzed liquefaction, glyoxal cross‐linking, and epoxidation. To simultaneously enhance flame retardancy and mechanical strength, attapulgite (ATP) was organically engineered with a phosphorus–silicon coupling agent (KH560–DOPO) to create a hybrid filler (AKD). The incorporation of 6 wt% AKD enabled the composite to achieve a UL‐94 V‐0 rating and a high limiting oxygen index (33.1%), while tensile strength and elongation at break increased by 36.7% and 24.1%, respectively. The analysis confirmed the successful liquefaction of cellulose and the covalent grafting of phosphorus and silicon onto ATP. The AKD/LCP composite material has a synergistic flame retardant mechanism of condensed phase and gas phase. The synergistic P–Si–C framework effectively promoted char formation and reinforced the polymer network. This work demonstrates a scalable route to stabilize renewable cellulose into high‐performance epoxy resins, combining bio‐based chemistry with advanced flame‐retardant nanotechnology and providing new ideas for the development of fire‐resistant polymeric materials.
Liu et al. (Mon,) studied this question.