A method of preparing multi-functionalized cellulose and use thereof for preparing multi-functionalized nanofibrillated cellulose

A method of preparing multi-functionalized cellulose fibers, comprising subjecting cellulose fibers to:

• a first functionalization step for grafting a first organic functional group on the cellulose fibers, by reacting said cellulose fibers with a first reactant comprising a halogen atom and/or a vinyl group and/or a phenyl group, and comprising said first organic functional group, and devoid of hydroxyl function,
• and a second functionalization step for grafting a second organic functional group on the cellulose fibers, by reacting said cellulose fibers with a second reactant comprising a halogen atom and/or a vinyl group and/or a phenyl group, and comprising said second organic functional group, and devoid of hydroxyl function,
• wherein said first functionalization step and said second functionalization step are carried out concomitantly in one-pot in an alkaline reaction medium, each of said first reactant and said second reactant being present in said reaction medium in an amount of between 0.015 and 10 mmol per gram of cellulose.