Abstract
All-cellulose nanocomposites reinforced by cellulose nanocrystals (CNC) were produced using a solvent consisting of 1-butyl-3-methylimidazolium chloride and dimethyl sulfoxide. Microcrystalline cellulose (MCC) was pre-dissolved at high temperature in the solvent. Freeze-dried CNC were then added to the slurry at room temperature, thereby avoiding complete CNC dissolution. Solid all-cellulose composite films were obtained by film casting, solvent exchange and drying. The MCC to CNC ratio was kept constant while the solvent content was incremented. The short-range and long-range cellulose–cellulose interactions in the solid materials were respectively assessed by Fourier-transform infrared spectroscopy and X-ray diffraction. The CNC used in this work contained both cellulose I and cellulose II. The cellulose concentration in the mixture drastically changed the overall crystallinity as well as the cellulose I to cellulose II ratio in the ACC. Cellulose II was formed by recrystallisation of the dissolved fractions. These fractions include the pre-dissolved MCC and the cellulose II portion of the CNC. Cocrystallisation with the cellulose I CNC acting as a template was also evidenced. This phenomenon was controlled by the initial solvent content. The correlation between the hygromechanical properties and the nanostructure features of the ACC was investigated by humidity-controlled dynamic mechanical analysis (RH-DMA). The introduction of the cocrystallisation and percolation concepts provided a thorough explanation for the humidity dependency of the storage modulus.
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Abbreviations
- AFM:
-
Atomic force microscopy
- TEM:
-
Transmission electron microscopy
- FTIR:
-
Fourier-transform infrared spectroscopy
- WAXD:
-
Wide-angle X-ray diffraction
- RH-DMA:
-
Humidity-controlled dynamic mechanical analysis
- BmimCl:
-
1-Butyl-3-methylimidazolium chloride
- MCC:
-
Microcrystalline cellulose
- CNC:
-
Cellulose nanocrystals
- DMSO:
-
Dimethyl sulfoxide
- ACC:
-
All-cellulose composites
- RCF:
-
Regenerated cellulose film
- LOI:
-
Lateral order index
- TCI:
-
Total crystallinity index
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Acknowledgments
The authors would like to thank Emilie Perrin (BIA) for her help with the TEM. Financial support from the CNRS was provided through a PEPS grant (BioMIMCellwalL). BD would like to dedicate this article to the memory of the late Dr Roger H. Newman.
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Lourdin, D., Peixinho, J., Bréard, J. et al. Concentration driven cocrystallisation and percolation in all-cellulose nanocomposites. Cellulose 23, 529–543 (2016). https://doi.org/10.1007/s10570-015-0805-x
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DOI: https://doi.org/10.1007/s10570-015-0805-x