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Properties of bacterial cellulose transparent film regenerated from dimethylacetamide–LiCl solution
Author(s) -
Yudianti R.,
Syampurwadi A.,
Onggo H.,
Karina M.,
Uyama H.,
Azuma J.
Publication year - 2016
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3782
Subject(s) - dimethylacetamide , materials science , dissolution , lithium chloride , bacterial cellulose , ultimate tensile strength , cellulose , amorphous solid , fourier transform infrared spectroscopy , chemical engineering , magic angle spinning , elongation , solvent , polymer chemistry , composite material , nuclear magnetic resonance spectroscopy , crystallography , organic chemistry , chemistry , metallurgy , engineering
Excellent transparent films were prepared from bacterial cellulose (BC) sheets by solubilization of its defibrillated freeze‐dried specimens in a solvent of dimethylacetamide (DMAc) containing 8.0% (w/w) lithium chloride (LiCl), and their properties were compared with those of the native BC. Fibrillar structure of the native BC disappeared after dissolution, and the film formed after dissolution also loose this structure. Occurence of structural transformation from crystalline to amorphous state was also evidenced by X‐ray diffraction, solid state cross polarization/magic angle spinning 13 C‐NMR and attenuated total reflectance–Fourier transform infrared spectroscopic analyses. In addition, excellent 3D uniform structure of the transparent BC film was further evidenced by X‐ray micro computed tomography. Plastic‐like characteristic was enhanced by film formation after dissolving the BC specimens in the DMAc–LiCl solution as shown by changing mechanical properties, a slight decrease in tensile strength (67.2 to 59.6 MPa) and breaking stress (67.2 to 58.4 MPa) but significant increase in elongation at break from 3.4 to 10.5%, and improvement of work of fracture from 5.8 to 21.2 kJ/m 2 . Copyright © 2016 John Wiley & Sons, Ltd.