Mechanical properties of nanocellulose based materials, such as films, hydrogels, aerogels, and macrofibers, are closely associated with their building blocks. Cellulose nanofibers (CNFs) with long length and small diameter are preferable when aiming for high mechanical performances. While current CNFs preparation processes can severely damage the natural structure of cellulose, leading to low aspect ratio and low degree of polymerization (DP). Herein, we demonstrate a mild process for fabrication of CNFs with high DP, long length and small diameter. The DP of wood pulps was nearly 2500, which is 250% higher than commercial pulps, and the DP of final CNFs are higher than 1000, which is similar to conventional cellulose microfiber. The diameter of CNFs is only ~4 nm, and the aspect ratio reached ~1000. The mechanical properties of both CNF films and macrofibers are significantly improved by building blocks optimization. This work provides a mild process of making CNFs with high DP and large length-diameter ratio for high performance nanocellulose-based materials.
关键词
Cellulose nanofibers,degree of polymerization,delignification,mechanical property
报告人
Jie Zhou
doctoral studentSouth China University of Technology
稿件作者
Jie ZhouSouth China University of Technology
Zhiqiang FangState Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Wushan Road 381, Guangzhou, 510640 P.R China
Xueqing QiuState Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Wushan Road 381, Guangzhou, 510640 P.R China;School of Chemical Engineering and Light Industry, Guangdong University of Technology, Waihuan Xi Road 100, Guangzhou, 510006 P.R China
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