Lignin grafted acrylic acid-acrylamide superabsorbent resin LS-g-P(AA-co-AM) was prepared by solution polymerization with temperature step-increasing mode.FTIR,SEM and TGA were employed to characterize the superabsorbent resin.Water absorbency and physiological saline absorbency of the resin were measured.LS-g-P(AA-co-AM) shows high water absorbency(1 156 g/g) and high physiological saline absorbency(122 g/g).FTIR analysis confirmed the graft copolymerization of lignosulfonate with acrylic acid and acrylamide.SEM photograph show the lig...