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Green fabrication of thermally-stable oxidized cellulose nanocrystals by evolved Fenton reaction and in-situ nanoreinforced thermoplastic starch

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Abstract

High performance fibers and improved interfacial interaction can enhance the properties of polymer composites. Herein, microcrystalline cellulose (MCC) was oxidized by H2O2/CuSO4, a new Fenton process, to achieve oxidized MCC (OCNCs) with 16 ± 1% carboxyl content. Noteworthy, the thermal stability of OCNCs was superior to CNCs prepared by acid hydrolysis. Interestingly, the primary alcohol groups of MCC were selectively oxidized and OCNCs achieved 11.0 nm, 231.6 nm and 72% of average diameter, length and degree of crystallinity, respectively. Then glycerol, starch and OCNCs were reactive extruded to fabricate TPS/OCNC bionanocomposites and their structure and performance were evaluated systematically. Strikingly, significant improvement in glass transition temperature (from 63.1 to 94.5 °C) and notch impact strength (from 1.3 to 3.9 kJ/m2) were noted for the amorphous TPS/OCNCs with 1 wt % OCNCs, and its tensile strength achieved 20.5 MPa, simultaneously. The improved performance was ascribed to in situ formation of “carboxyl-hydroxyl” hydrogen bonds that acted as cross-links and improved the interfacial compatibility. We showcase the Fenton reaction and reactive extrusion as a facile strategy to prepare sustainable and biodegradable TPS/OCNC bionanocomposites with properties more suitable for everyday applications to replace petroleum-based plastic and eliminate the pollution by “microplastics”.

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Acknowledgments

The authors wish to acknowledge the academic discussion from Prof. Baochun Guo and financial support of the National Natural Science Foundation of China (No. 51773068), Fund Research Grant for Science and Technology in Guangzhou (202002030143), Natural Science Foundation of Guangdong Province (2021A1515010551), SKL of Bio-Fibers and Eco-Textiles (Qingdao University) K2019-05, and The Scientific and Technological Plan of Guangdong Province, China (No. 2019B090905005)”.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

The authors declare the following financial interests/personal relationships which may be considered as potential competing interests.

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Conceptualization: SZ; formal analysis and investigation: JY and BG; writing—original draft preparation: BG; writing—review and editing: SZ; funding acquisition: SZ; resources: SZ; supervision: SZ notes.

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Correspondence to Shuidong Zhang.

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Gao, B., Yang, J., Zhang, S. et al. Green fabrication of thermally-stable oxidized cellulose nanocrystals by evolved Fenton reaction and in-situ nanoreinforced thermoplastic starch. Cellulose 28, 8405–8418 (2021). https://doi.org/10.1007/s10570-021-04039-7

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  • DOI: https://doi.org/10.1007/s10570-021-04039-7

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