纤维素是自然界中分布最广、含量最多的一种多糖，是维管束植物、地衣植物以及一部分藻类细胞壁的主要组成成分，占植物界碳含量的50%以上。北京理工大学材料学院邵自强课题组利用天然多酚类有机化合物没食子酸对纤维素纳米纤维进行表面改性，使其形成一种具有亲水主体和疏水侧链的特殊结构，提高韧性的同时兼具一定的功能特性。

Highlights：

1. The CNF-GA is synthesized by hydrophobic modification of CNF through GA and is used as the “polymer dipole.”

2. The toughness of the CNF-GA film has been dramatically improved.

3. The excellent piezoelectric and piezoresistive sensing properties are possessed by CNF-GA-2/MXene film.

Fig. 1. Chemical structure of CNF and CNF-GA films. (a) C-NMR, (b) XPS, (c) ATR- FTIR, (d) XRD patterns, (e) UV-vis, and (f) Zeta potential spectra of CNF and CNF-GA films.

Fig. 2. The thermal and thermomechanical properties of CNF and CNF-GA films. (a) Variation images of (a) tanδ, (b) storage modulus, and (c) loss modulus with temperature for CNF-GA films. (d) DSC thermograms of CNF-GA (1nd heating scan at 10 °C/min). (e) Thermogravimetric and (f) differential thermogravimetric curves of the indicated CNF and CNF-GA films (10 ℃/min, N²).

Fig. 3. The mechanical properties and morphology of CNF and CNF-GA films. (a) Stress-strain curves, (b) puncture load curves, and (c) tearing strength of CNF and CNF-GA films. (d, e, f) Cross-section images and (g) EDS elemental mappings of CNF-GA-2 film.

Fig. 4. The water contact angle and water resistance properties of CNF and CNF-GA films. (a) Water contact angle, (b) water absorption, (c) solubility, and (d) moisture absorption of CNF and CNF-GA films.

相关论文以题为“Hydrophobic modification of cellulose nanofibers by gallic acid and the application in pressure sensing”发表在International Journal of Biological Macromolecules (1区TOP，IF=8.2)上。北京理工大学材料学院博士研究生李枝茂为论文的第一作者，通讯作者为邵自强教授。

论文链接：

https://doi.org/10.1016/j.ijbiomac.2024.129770