Silk fibroin/hydroxyapatite Lignosulfonate/APP IFR and its flame retardancy in lignosulfonate- based rigid polyurethane foamshydrogel induced by gamma-ray irradiation for bone tissue engineering

Lignin containing substantial aromatic rings and high content of carbon has been employed as carbonizing agent to investigate the flame retardancy in the lignin/ammonium polyphosphate (APP) intumescent flame retardant (IFR) system.