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Polymers 2018, 10(6), 614;

Preparation and Characterization of Regenerated Cellulose Film from a Solution in Lithium Bromide Molten Salt Hydrate

College of Light Industry and Food, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
Department of Biological System Engineering, University of Wisconsin-Madison, 460 Henry Mall, Madison, WI 53706, USA
Authors to whom correspondence should be addressed.
Received: 27 April 2018 / Revised: 1 June 2018 / Accepted: 1 June 2018 / Published: 4 June 2018
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In this study, the molten salt hydrate of lithium bromide (LiBr) was utilized as a non-derivatizing cellulose dissolution solvent to prepare regenerated cellulose films for kraft pulp. The effects of LiBr concentrations (60, 62, and 65 wt %) and dissolving time (from 5 to 40 min with the interval of 5 min) on the structures and the properties of the films were investigated. Fourier transform infrared (FT-IR) and cross-polarization magic-angle spinning carbon-13 nuclear magnetic resonance (CP/MAS 13C NMR) characterizations verified the breakage of inter- and intra-cellulose hydrogen bonds during the regeneration, resulting in the disruption of the crystalline structure of cellulose. X-ray diffraction (XRD) data indicated that the regeneration converted the polymorphism of cellulose from I to II as well as decreased its crystallinity. Ultraviolet-visible spectra (UV-Vis) and scanning electron microscopy (SEM) analyses revealed the excellent optical transparency of the films to visible light due to the complete dissolution of cellulose fibers as well as the sufficient breaking of the inter- and intra-cellulose hydrogen bonds. In terms of tensile testing, tuning LiBr concentrations and dissolving time could increase the elongation at break and tensile strength of the films. The maximum elongation at break of 26% and tensile strength of 67 MPa were achieved when the films prepared in 65 wt % LiBr for 10 and 15 min, respectively. These results indicated the great potential of the cellulose films for packaging use. View Full-Text
Keywords: inorganic ionic liquid; kraft pulp; non-derivatizing dissolution; packaging film inorganic ionic liquid; kraft pulp; non-derivatizing dissolution; packaging film

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, X.; Xiao, N.; Wang, H.; Liu, C.; Pan, X. Preparation and Characterization of Regenerated Cellulose Film from a Solution in Lithium Bromide Molten Salt Hydrate. Polymers 2018, 10, 614.

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