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A copolymer of alkali lignin and polyacrylamide was fabricated by graft copolymerization, and further chelated with Fe3+. The obtained lignin chelate with star structure was used as synergistic agent and catalyst with the incorporation of intumescent flame retardants (IFRs) to prepare flame‐retarded poly (butylene succinate) (PBS) composites. The replacement of IFR by lignin chelate favors the enhancement...