writer：Xian Cao, Bei He, Jianlin Wang, Chunhui Zhang, Donglin Tang, Qingyou Liang, Chuanfu Liu, Huiming
keywords：protection of paper documents，nanocellulose，reinforcement，aging resistance
source：期刊
specific source：Paper and Biomaterials
Issue time：2023年
Paper documents experience severe acidification and embrittlement.Nanocellulose is an excellent reinforcement material for paper documentsowing to its compatibility and excellent mechanical strength. However, littleresearch has been conducted on the aging resistance of nanocellulose-reinforcedpaper. In this study, six types of nanocelluloses were used to reinforce agedpaper. The reinforcement and anti-aging performances were evaluated, andthe anti-aging mechanism was further clarified. Nanocellulose with a highdegree of polymerization can better enhance aged paper, and non-chemicalnanocellulose also shows better anti-aging performance, such as nanocelluloseprepared by mechanical or biological methods. However, nanocelluloseprepared using chemical methods exhibits poor reinforcement and anti-agingperformance. This is because it has a small particle size that is not beneficialfor physical crosslinking with paper fibers. More importantly, the introductionof acidic or oxidizing groups on nanocellulose accelerates the acid hydrolysisand oxidation rate of paper fibers, especially nanocellulose prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl oxidation, which should not be used to protectpaper documents.