Sugarcane bagasse (SCB) was mechanically activated by a stirring-type ball mill.Graft copolymer (SCB-g-PAA) of SCB with different mechanical activation times and partially neutralized acrylic acid (AA) was synthesized by free radical polymerization using ammonium persulfate/sodium sulfite redox pair in aqueous solution.The effects of activation times

ratio of SCB to AA

reaction time and reaction temperature on the grafting ratio and grafting efficiency were investigated.The granule morphology

functional groups

crystal structure of the SCB with different activation times and SCB-g-PAA were characterized by using scanning electron microscopy (SEM)

Fourier transform infrared spectroscopy (FT-IR). It was found that the graft co-polymerization was strengthened obviously by mechanical activation

and grafting ratio and grafting efficiency increased with activation time.This could be attributed to that mechanical activation broke the sealing of cellulose by lignin

decreased the degree of crystallinity of cellulose

made it more accessible to AA

and improved the reactivity of cellulose.Grafting ratio and Grafting efficiency were obtained in the values of 165.29% and 82.70% by graft co-polymerization of bagasse activated for 1.5 h and acrylic acid in the conditions: reaction time 3 h

ratio of acrylic acid(volume) to sugarcane bagasse(mass) 6 and reaction temperature 60℃.