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Preparation of hemp nanocellulose and its use to improve the properties of paper for food packaging

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Abstract

The study describes the preparation of nanocellulose from organosolv hemp pulp and its application in the production of food packaging paper as an alternative to petroleum products. OHP was obtained from renewable plant materials hemp fibers by extraction with NaOH solution and cooking using a mixture of acetic acid and hydrogen peroxide. A stable transparent nanocellulose gel was extracted from OHP by acid hydrolysis followed by ultrasonic treatment. It was found that an increase in the consumption of sulfuric acid, temperature and duration of the OHP hydrolysis process improved the quality indicators of hemp nanocellulose. A linear dependence of the tensile strength and transparency of nanocellulose films on their density has been established. Morphological (SEM), structural (FTIR and XRD) and thermal analysis (TGA) of hemp fibers, OHP and nanocellulose were carried out. Nanocellulose films had a density of up to 1.56 g/cm3, a tensile strength of up to 66.7 MPa, a transparency of up to 87.3%. Atomic force microscopy method showed that the transverse dimension of nanocellulose particles is from 8 to 23 nm. Hemp nanocellulose had a higher crystallinity index (87.2%) than OHP (72.0%), but lower thermal stability. The positive effect of adding nanocellulose from hemp on improving all quality parameters of paper for food packaging has been shown. The addition of 2% hemp nanocellulose makes it possible to obtain paper that exceeds the breaking force requirements of premium grade paper by 40%, and the breaking length increases by 42% compared to paper without chemical additives.

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Funding

This work was supported by the Ministry of Education and Science of Ukraine, project No. 2301.

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Contributions

Valerii Barbash designed the study, interpreted the experimental data, and drafted the manuscript. Roman Zakharko and Olga Yashchenko extracted organosolv pulp and nanocellulose from hemp fibers and studied its physical and mechanical properties. Olga Yakymenko received samples of the paper and examined its performance. Volodymyr Myshak has investigated the FTIR spectra and TGA of OHP and NC. All authors read and approved the final manuscript.

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Correspondence to V. A. Barbash.

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This work does not contain any studies with human participants or animals performed by any of the authors. The authors claim the compliance with the ethical standards.

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Barbash, V.A., Yashchenko, O.V., Yakymenko, O.S. et al. Preparation of hemp nanocellulose and its use to improve the properties of paper for food packaging. Cellulose 29, 8305–8317 (2022). https://doi.org/10.1007/s10570-022-04773-6

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  • DOI: https://doi.org/10.1007/s10570-022-04773-6

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