Two types of
O-carboxymethylated chitosan (
O-CMCh)/cellulose polyblends were prepared by mixing cellulose LiCl/
N,
N-dimethylacetamide (DMAc) solution with
O-CMCh aqueous solution (I) or DMAc emulsion (II) and their corresponding films (I and II) were regenerated in water. The (
O-CMCh)/cellulose films obtained were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and wide-angle X-ray-scattering (WAXS). FTIR analyses showed that amino groups of
O-CMCh were not affected during the film formation. SEM observations indicated that the
O-CMCh/cellulose polyblend displayed a heterogeneous microstructure.
O-CMCh microdomains dispersed in the cellulose matrix of the blend film. Blend film I showed a better dispersion of the
O-CMCh microdomains than blend film II did. DSC and WAXS analyses suggested that, for both two kinds of the blend films, the addition of
O-CMCh did not significantly influence the crystallinity and thermal properties of cellulose. The antibacterial activity of the films against
Escherichia coli (
E.
coli) was also measured via optical density method. Both blend films I and II exhibited satisfying antibacterial activity against
E.
coli, even the
O-CMCh concentration was only 2 wt%. Due to the coagulation effect of water on the polyblend,
O-CMCh water solution is suitable for the preparation of the blend film with low
O-CMCh concentration, while
O-CMCh DMAc emulsion should be selected when high
O-CMCh concentration is needed.
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