Translation of the outstanding mechanical performance of individual nanocellulose to macroscopic nanocellulose films can be achieved by various alignment techniques. However, attention has seldom been paid to the degree of polymerization (DP) of cellulose that plays a pivotal role in increasing the mechanical strength of nanocellulose films. In this work, nanocellulose film with superior tensile strength (1,014.7 ± 69.1 MPa) is presented by a cellulose DP protection strategy. An alkaline sulfite-anthraquinone-methanol pulping is applied to not only rapidly remove most of lignin and hemicellulose from wood blocks, which facilitates the formation of hydrogen bonds among neighboring fiber cell walls in subsequent mechanical pressing, but also to significantly suppress the decomposition of cellulose DP. Such strong nanocellulose film sheds light on unlocking the exceptional mechanical potential of cellulose and has the potential for use in advanced applications traditionally dominated by nonrenewable materials such as plastics, glass, and metals.

可以通过各种排列技术将单个纳米纤维素的出色机械性能转化为宏观纳米纤维素膜。然而，很少关注纤维素的聚合度（DP），其在增加纳米纤维素膜的机械强度中起关键作用。在这项工作中，通过纤维素DP保护策略提出了具有卓越拉伸强度（1,014.7±69.1 MPa）的纳米纤维素膜。使用碱性亚硫酸盐-蒽醌-甲醇制浆技术，不仅可以从木块中快速去除大部分木质素和半纤维素，从而在随后的机械压制中促进相邻纤维细胞壁之间氢键的形成，而且还可以显着抑制纤维素的分解DP