Abstract
The development of biodegradable food packaging materials continues to be of significant interest because of its benefits. Among these materials, cellulose-based composites are candidates to replace conventional, petroleum-based food packaging materials. However, incomplete dissolution of cellulose has hindered its large-scale application. Since undissolved cellulose can affect the mechanical properties of the film, full dissolution is preferred. This work explores the use of plasma irradiation as a pretreatment step before the dissolution of cellulose in lithium chloride–N,N-dimethylacetamide (LiCl–DMAc) solvent. Prior to swelling, the cellulose was exposed to subatmospheric oxygen (O\(_2\)) plasma to initiate glycosidic bond cleavage without intense degradation of cellulose. Fourier transform infrared, Raman, and X-ray photoelectron spectral analyses revealed decrystallization and oxidation of the surface after plasma treatment which enhanced the dissolution of cellulose in LiCl–DMAc. Mechanical tests of drop-casted films revealed that plasma-treated cellulose greatly enhanced the mechanical strength of the film compared to that of untreated cellulose whose film was too weak for the tensile test. This work showed that exposure to O\(_2\) plasma as a pretreatment step can improve the dissolution of cellulose via decrystallization and thereby can be coupled with other natural materials as alternative to food packaging materials.
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Acknowledgments
The authors would like to thank the Engineering Research and Development for Technology of the Department of Science and Technology (DOST-ERDT). The nanoQuench project (CHED PCARI IIID-2016-007) is acknowledged for the use of Raman Spectroscopy while Osaka University is also acknowledged for the XPS runs. Dr. N. Hideki is gratefully acknowledged for the assistance in the analysis of XPS data. M. Vasquez acknowledges the University of the Philippines Office of the Vice President for Academic Affairs BALIK-PhD Research Grant (OVPAA-BPhD-2014-01) and the Jardiolin Family Professorial Chair.
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Lao, T.L.B., Cordura, S.L.A., Diaz, L.J.L. et al. Influence of plasma treatment on the dissolution of cellulose in lithium chloride–dimethylacetamide. Cellulose 27, 9801–9811 (2020). https://doi.org/10.1007/s10570-020-03454-6
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DOI: https://doi.org/10.1007/s10570-020-03454-6