期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 107, 期 -, 页码 2686-2694出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2017.10.162
关键词
Sodium alginate; Polyvinyl alcohol; Nano SiO2; Sol-gel method; Nanocomposite films
资金
- Natural Science Foundation of China [51303089]
- Special Fund for Self-directed Innovation of Shandong Province of China [2013CXB80201]
- Doctor Star-up Foundation of Qingdao Agriculture University [663/1117013]
Sodium alginate (SA)/polyvinyl alcohol (PVA)/SiO2 nanocomposite films were prepared by in situ polymerization through solution casting and solvent evaporation. The effect of different SA/PVA ratios, SiO2, and glycerol content on the mechanical properties, water content, water solubility, and water vapor permeability were studied. The nanocomposite films were characterized by Fourier transform infrared, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and thermal stability (thermogravimetric analysis/differential thermogravimetry) analyses. The nanocomposites showed the highest values of mechanical properties, such as SA/PVA ratio, SiO2, and glycerol content was 7:3, 6 wt.%, and 0.25 g/g SA, respectively. The tensile strength and elongation at break (E%) of the nanocomposites increased by 525.7% and 90.7%, respectively, compared with those of the pure alginate film. The Fourier transform infrared, spectra showed a new Si-O-C band formed in the SA/PVA/SiO2 nanocomposite film. The scanning electron microscopy image revealed good adhesion between SiO2 and SA/PVA matrix. After the incorporation of PVA and SiO2, the water resistance of the SA/PVA/SiO2 nanocomposite film was markedly improved. Transparency decreased with increasing PVA content but was enhanced by adding SiO2. (C) 2017 Published by Elsevier B.V.
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