Tuning the properties of pineapple peel cellulose nanofibrils by TEMPO-mediated oxidation and ball milling

Autor: Tianyi Lv, Yuan Chen, Yuyuan Luo, Difei Dai, Xin Feng, Hai Chen, Yong Yu, Liang Ma, Yuhao Zhang, Hongjie Dai
Rok vydání: 2022
Předmět:
Zdroj: Cellulose. 29:9609-9625
ISSN: 1572-882X
0969-0239
Popis: 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 (FTIR), X-ray diffraction (XRD), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS) and thermogravimetry (TG), 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 ~ -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.
Databáze: OpenAIRE
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