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Cellulose nanocrystals obtained from microcrystalline cellulose by p-toluene sulfonic acid hydrolysis, NaOH and ethylenediamine treatment

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Abstract

Cellulose nanocrystals (CNCs) were first isolated from microcrystalline cellulose (MCC) by p-toluene sulfonic acid (p-TsOH) hydrolysis. Cellulose II nanocrystal (CNC II) and cellulose III nanocrystal (CNC III) were then formed by swelling the obtained cellulose I nanocrystal (CNC I) in concentrated sodium hydroxide solutions and ethylenediamine (EDA) respectively. The properties of CNC I, CNC II and CNC III were subjected to comprehensive characterization by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results indicated that CNC I, CNC II and CNC III obtained in this research had high crystallinity index and good thermal stability. The degradation temperatures of the resulted CNC I, CNC II and CNC III were 300 °C, 275 °C and 242 °C, respectively. No ester bonds were found in the resulting CNCs. CNCs prepared in this research also had large aspect ratio and high negative zeta potential.

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Acknowledgments

The project is supported by the Foundation of Guangxi Key Laboratory of Clean

Pulp & Papermaking and Pollution Control, College of Light Industry and Food

Engineering, Guangxi University (No. 2019KF12), and the Shandong Province of China Key Research and Development Project (No. 2019GGX102026).

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Correspondence to Songlin Wang.

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Wang, S., Wang, Q. & Kai, Y. Cellulose nanocrystals obtained from microcrystalline cellulose by p-toluene sulfonic acid hydrolysis, NaOH and ethylenediamine treatment. Cellulose 29, 1637–1646 (2022). https://doi.org/10.1007/s10570-021-04409-1

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  • DOI: https://doi.org/10.1007/s10570-021-04409-1

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