Journal
CARBOHYDRATE POLYMERS
Volume 87, Issue 2, Pages 1020-1025Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.06.040
Keywords
Bacterial cellulose; Dissolution; NMMO; Film
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Funding
- China Postdoctoral Science Foundation
- Key Projects in the National Science & Technology Pillar Program [2006BAD30B02]
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Bacterial cellulose (BC) was dissolved in N-methylmorpholine N-oxide (NMMO) to prepare regenerated BC films (RBC) with phase inversion. The solubility of BC, supermolecule on structure, morphology, thermal and physical properties of the films were investigated by Fourier transform infrared spectroscopy (FT-IR), solid-state cross polarization/magic angle spinning C-13 nuclear magnetic resonance (CP/MAS C-13 NMR), wide-angle X-ray diffraction (WAXD), scanning electron microscope (SEM), and thermogravimetric analysis (TGA). The investigation suggested BC was dissolved completely in NMMO. From the C-6 signal shifts to the amorphous area, the crystallinity of materials decreased from 79.20% to 38.17%, and the transformation from cellulose I to II occurred. It was also found that the banded structure of the native materials was replaced by homogeneous and densified sections, so RBC films had better mechanical and barrier properties, and do thermal stability was similar to that of the native BC. (C) 2011 Published by Elsevier Ltd.
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