Preparation of treelike and rodlike carboxymethylated nanocellulose and their effect on carboxymethyl cellulose films

Abstract

In this work, carboxymethyl cellulose (CMC) with low substitution degree, followed by different posttreatments, was applied to prepare treelike CMC nanofibrils (CMCNFs) and rodlike CMC nanocrystals (CMCNCs), and their performance in CMC composite film was evaluated simultaneously. From transmission electron microscopy results, it was found that the treelike CMCNCFs exhibited a lager aspect ratio compared to the rodlike CMCNCs. As for reinforcing CMC film, 4 wt% was the best adding amount, at this time, the tensile strength of CMC/CMCNFs and CMC/CMCNCs composite films was increased by 72.1% and 47.3%, respectively. Moreover, adding these nanofillers to CMC also could enhance the thermal stability of composite films slightly, while the transmittance of composite films was reduced at the same time. In addition, CMC/CMCNFs film was designed as a packaging box to determine its performance. Therefore, this study could reveal the differences of properties for composites with different types of nanocellulose and provide a foundation for further application of nanocellulose.

A bio-based functional separator enables dendrite-free anodes in aqueous zinc-ion batteries

“…In this work, the CNFs were used as the matrix and carboxymethyl cellulose (CMC) was used as the optimized component. The additive of CMC will further enhance the mechanical properties of cellulose-based separators 31 and demonstrate better Zn 2+ binding and water trapping ability compared to CNFs. 30 Finally, CMC-reinforced CNFs (CRC) separators were obtained.…”

Temperature-Sensitive Aerogel Using Bagasse Carboxylated Cellulose Nanocrystals/N-Isopropyl Acrylamide for Controlled Release of Pesticides

“…The preparation process of CCNCs focuses on reducing the size of cellulose, removing the amorphous region in cellulose as far as possible [6][7][8], and modifying the primary and secondary hydroxyl groups on the surface of cellulose to improve the miscibility and interfacial compatibility of the product CCNCs with solvents and give it new functions [9,10]. The common preparation principle is to directly oxidize the primary hydroxyl group on the surface of the cellulose.…”