Nanocellulose is a type of cellulose with a diameter smaller than 100 nm,which is extracted from plant cell walls and can be rod-,whisker- and fiber-shaped. Nanocellulose possesses impressive features,including low density,renewability,biodegradability,biocompatibility,high modulus and low thermal expansion coefficient,and so on . The chemical properties of nanocellulose are monotonous due to the abundance of active hydroxyl groups on its surface,which makes it strong hydrophilicity and therefore limits its applications. The abundant hydroxyl groups on the cellulose surface provide a wide range of possibilities for chemical modifications and functionalization. Further chemical modification and functionalization can help expand the scope of their applications. Click chemistry possesses remarkable advantages such as high selectivity,modularization,high yield,rapid reaction,and so on. The click reaction is simple and is not sensitive to water or oxygen. In recent years,click chemistry has been increasingly applied for the chemical modification and functionalization of nanocellulose. In this review,the research progress on the applications of two main types of click reactions,i. e. azide-alkyne and thiol-ene,in the modification and functionalization of nanocellulose is mainly introduced,and the applications of click-modified nanocellulose used in composites,hydrogels,aerogels are also briefly summarized. Finally,difficulties and challenges facing the preparation,modification,and applications of nanocellulose based on the ‘click chemistry’strategy are summarized. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
