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    Characterization and property investigation of novel eco-friendly agar/carrageenan/TiO2 nanocomposite films

    Year: 2019

    Journal: J. Appl. Polym. Sci., Volume 136, MAR 10

    Authors: Hou, X.; Xue, Z.; Liu, J.; Yan, M.; Xia, Y.; Ma, Z.

    Organizations: National High Technology Research and Development Program of ChinaNational High Technology Research and Development Program of China [2010AA093701]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [50803030]; Program for Changjiang Scholars and Innovative Research Team in UniversityProgram for Changjiang Scholars & Innovative Research Team in University (PCSIRT) [IRT0970]; Postdoctoral Science Special Foundation of ChinaChina Postdoctoral Science Foundation [201104581]; Postdoctoral Science Foundation of ChinaChina Postdoctoral Science Foundation [20100471495]; Program for Excellent Innovative Research Team of Shandong Province, China [TD200902]

    Agar/kappa carrageenan (AG/CA) nanocomposite films are prepared using thermal casting method in the presence of various concentrations of nano-TiO2 (0.5, 1, 1.5, and 2 g/100 g). As nano-TiO2 content rises from 0 to 1 g/100 g, tensile strength (TS) increases from 30.8 to 60.6 MPa. However, TS decreases gradually as nano-TiO2 content further raises. TS of films containing 1 g/100 g nano-TiO2 increases by 96.8% when compared to those prepared without nano-TiO2. The reason may be related to the formation of intermolecular hydrogen bonding and coordinate bonds between nano-TiO2 and matrix molecules. Elongation at break decreases gradually as nano-TiO2 concentration increases. The addition of nano-TiO2 improves barrier properties of films against ultraviolet light, while it decreases their transparency. Swelling and water solubility of the films containing 1 g/100 g nano-TiO2 decrease, further demonstrating that interaction forces are formed between nano-TiO2 and matrix molecules. The addition of nano-TiO2 significantly declines water vapor permeability. Overall, films containing 1 g/100 g nano-TiO2 show the best mechanical, optical, and water resistance properties. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47113.
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