Abstract
In this work, cellulose nanoparticles regenerated by water, methanol, ethanol and n-propanol as the anti-solvents from ionic liquid solution were studied systematically. Crystallinity and enthalpy in cellulose degradation of the regenerated cellulose decreased in the order water > methanol > ethanol > n-propanol. Nevertheless, the thermal stability of the regenerated cellulose showed an opposite trend. In addition, morphology of regenerated cellulose changed sharply with the variation of anti-solvents. Moreover, we introduced Kamlet–Taft parameters of anti-solvents to analyze the crystallinity, enthalpy in cellulose degradation and thermal stability variation of regenerated cellulose. Hydrogen bond acidity and basicity of anti-solvent definitely drove the property variation of regenerated cellulose nanoparticles to opposite directions. Furtherly, we proposed two competitive cellulose regeneration routes, providing a reasonable explanation to the crystallinity, enthalpy in cellulose degradation and thermal stability variation of regenerated cellulose nanoparticles. Our work successfully demonstrate that H-bond acidity/basicity of anti-solvent could tune the property of regenerated cellulose nanoparticles, unveiling the competitive routes of cellulose regeneration.
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This research was supported by National Natural Science Foundation of China (No. 31370556), Beijing Municipality Science and Technology Planning Project (D161100002116001).
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Fan, Z., Chen, J., Guo, W. et al. Anti-solvents tuning cellulose nanoparticles through two competitive regeneration routes. Cellulose 25, 4513–4523 (2018). https://doi.org/10.1007/s10570-018-1897-x
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DOI: https://doi.org/10.1007/s10570-018-1897-x