Preparation and characterization of nano-SiO2 reinforced alginate-based nanocomposite films (II)

Research paper by Manli Yang, Yanzhi Xia

Indexed on: 16 Jun '17Published on: 11 Jun '17Published in: Journal of Applied Polymer Science


Crosslinked alginate-based nanocomposites at different SiO2 contents were prepared successfully by blending the nano-SiO2 solution into low concentration alginate solution (0.5 wt %), with the alginate concentration increased step by step to the resulted concentration, in this course glycerol was used as plasticizer and 5 wt % CaCl2 as crosslinker. The combined effect of SiO2 content (1.5–8 wt %) on the microstructural, physical, mechanical, and optical properties of the nanocomposite films were investigated. The results showed that tensile strength and elongation was improved by about 40.33% and 89%, respectively, upon increasing the SiO2 content to 4.5 wt %. In addition, water vapor permeability and swelling degree decreased by 19% and 16% with increasing SiO2 content up to 8 wt % and 4.5 wt %, respectively with respect to pure crosslinked alginate film. Thermogravimetric analysis also revealed that nano-SiO2 can improve the thermal stability of sodium alginate films produced by this method. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45286.