All solvents used in this study were of analytical grade, and the
chemicals used for synthesizing were of reagent grade and commercially
available. Cellulose (99.5%) was purchased from Henan
Xiren Cellulose Co., Ltd. and used as received. Maleic anhydride
(99.5%) was purchased from the Tianjin No. 1 chemical reagent factory.
Deionized water was used throughout the experiments.