Abstract
Novel water-resistant cellulose films from castor-oil-based polyurethane (PU) and benzoyl konjac glucomannan (BKGM) semi-interpenetrating polymer networks (semi-IPNs) forming a superthin coating on the cellulose films, which was regenerated from cellulose in 6 wt % NaOH/5 wt % thiourea aqueous solution, were prepared. The tensile strength (σb), water resistivity (R), light transmittance (Tr), and size constriction (Sc) of the coated films with coatings of 0.2−0.6 μm thickness and with different BKGM contents in the coatings were investigated. The values of σb, R, and Sc were 93 MPa, 0.57, and 0.8%, respectively, when the BKGM content in the coating was 5 wt %. Even when the coating layer thickness was 0.2 μm, the coated films still had higher tensile strength (80 MPa) and water resistivity (0.47) than cellulose film. The results from Fourier transform infrared spectroscopy, ultraviolet spectroscopy, transmission electron microscopy, and electron probe microanalysis indicate that much of the improvement of...
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