Preparation of Pomelo Peel Nanocrystalline Cellulose and Its Application in Improving the Properties of Carboxymethyl Starch Film
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Abstract:
Nanocrystalline cellulose (NCC) was prepared by sulfuric acid hydrolysis method using pomelo peel as the raw materials. The microstructure and crystal structure of the NCC were investigated. The effects of different NCC additions to carboxymethyl starch films on surface topography, water vapor permeability, light transmittance and mechanical properties of the composite films were investigated. It is revealed that the NCC consisted of rods with lengths ranging from 60 to 180 nm and diameters ranging from 3 to 15 nm. The X-ray diffraction indicates that the crystal structure of NCC is still type I. Scanning electron micrograph shows that the surface of the composite film is smooth and flat. It was found that the tensile strength of the nanocomposite films with 5% (W/W) NCC addition was optimum with an improvement of 52.22%. While the elongation at break of the composite films decreased with the addition of NCC. Water vapor permeability of the nanocomposite films decreased by 23% for the optimum 7% (W/W) NCC content. Although the addition of NCC has reduced the light transmittance of the composite films, it did not change the transmittance of the control films at different wavelengths. Therefore, the additions of NCC to carboxymethyl starch films can effectively improve the performance of the composite films and thus contribute to prepare films with good comprehensive properties.
