Preparation of cellulose nanocrystals via successive periodate and bisulfite oxidation and mechanical and hydrophilic properties of the films

Abstract

Microcrystalline cellulose was oxidized via periodate followed by sulfonation. The sulfonated cellulose nanocrystals were obtained through centrifugation, dialysis, and sonication. The sulfonated cellulose nanocrystals were rod-like and had an average length of 140 nm to 153 nm and an average width of 8 to 10 nm. The Fourier transform infrared profiles and polyelectrate titration demonstrated successful introduction of the sulfonated groups into the cellulose nanocrystals. The sulfonated cellulose nanocrystals had a higher crystallinity index than dialdehyde cellulose. The thin films fabricated via the casting of the sulfonated cellulose nanocrystals suspensions were highly hydrophilic.

Aldehyde content of dialdehyde cellulose determined via nitrate analysis

“…The aldehyde groups are chemically active and can be transformed into various kinds of functional groups via replacement, oxidation, and crossing-linking reactions (Kim et al 2000;Atalla and Isogai 2010;Rol et al 2019). A variety of specialized cellulose materials so far have been synthesized from dialdehyde cellulose (Zhang et al 2018;Keshk et al 2019;Wang et al 2021). Thus, the determination of the aldehyde content is crucial and has been the subject of numerous investigations and reviews (Maekawa and Koshijima 1991;Kim and Kuga 2001;Vicini et al 2004;Heinze et al 2018;Lucia et al 2019;Yu et al 2019;Nypelö et al 2021).…”