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    Enhancing hydrophobicity, strength and UV shielding capacity of starch film via novel co-cross-linking in neutral conditions

    Year: 2018

    Journal: R. Soc. Open Sci., Volume 5, NOV

    Authors: Ni Shuzhen; Jiao Liang; Zhang Hui; Zhang Yongchao; Fang Guigan; Xiao Huining; Dai Hongqi

    Organizations: National Science Foundation of China [31770417]; Graduate Student Practice Innovation Program of the Jiangsu Province [KYCX17_0837]; NSERC Canada

    Keywords: starch film; co-cross-linking; neutral condition; strength; hydrophobicity; transmittance

    Starch films are developed as the biodegradable packaging materials to replace the petroleum-based materials in recent years. Thus, it is extremely beneficial to improve the hydrophobicity and mechanical strength of starch films, through a novel approach of co-cross-linking in neutral conditions, with glyoxal and AZC. In this work, systematic studies have been conducted to assess the performance of the co-cross-linked starch along with the control starch and starch cross-linked by glyoxal or AZC alone. Results showed that the co-cross-linked starch films exhibited significantly improved hydrophobicity and strength and the wet stress reached 1.53 MPa, compared to the control, glyoxal or AZC cross-linked starch films. More interestingly, the co-crosslinked film also demonstrated excellent UV shielding capacity and transmittance at visible wavelength range. The reaction mechanism was revealed based on the findings from UV, FT-IR and NMR spectra. This work established an innovative approach to improving the performance of starch film in neutral conditions for packaging applications.
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