1. Tuning the properties of pineapple peel cellulose nanofibrils by TEMPO-mediated oxidation and ball milling.
- Author
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Lv, Tianyi, Luo, Yuyuan, Chen, Yuan, Dai, Difei, Feng, Xin, Chen, Hai, Yu, Yong, Ma, Liang, Zhang, Yuhao, and Dai, Hongjie
- Subjects
PINEAPPLE ,BALL mills ,FOURIER transform infrared spectroscopy ,X-ray photoelectron spectroscopy ,ATOMIC force microscopes ,CELLULOSE - Abstract
In this study, the oxidized cellulose nanofibrils from pineapple peel (PP-TOCNF) were prepared by TEMPO-mediated oxidation followed by ball milling. The influence of oxidation degree on the structure and properties of PP-TOCNF were investigated, including Fourier transform infrared spectroscopy , X-ray diffraction, atomic force microscope (AFM), X-ray photoelectron spectroscopy and thermogravimetry, as well as the potential application in aerogels. The results suggested that TEMPO oxidation facilitated the dispersion of PP-TOCNF due to the strong electrostatic repulsion between –COO
− groups. Regulating oxidation degree by varying NaClO concentration could effectively adjust the –COO− content (0.167–0.550 mmol/g), zeta potential (− 18 to − 34 mV) and rheological properties. The obtained PP-TOCNF showed a long fibrillar structure, whose average diameter and CrI values gradually decreased with the increase of oxidation degree. The PP-TOCNF-based aerogels exhibited a light weight, good porosity, water absorption, and mechanical properties, which also can be easily adjusted by oxidation degree of PP-TOCNF. Furthermore, TEMPO oxidation improved the stability and shape recovery ability of aerogels in water. [ABSTRACT FROM AUTHOR]- Published
- 2022
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