Abstract
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-cross-linked 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.
Highlights
Starch, a category of non-toxic, biodegradable and low-cost polysaccharide, has been widely applied to many fields and attracts a great deal of attention as a potential alternative to the conventional petroleum-based materials [1,2,3,4]
We found the addition of glyoxal can limit the self-polymerization of Ammonium zirconium carbonate (AZC) in aqueous solution
The adsorption of the as-prepared mixture solution of glyoxal and AZC was recorded with the UV–vis spectra, and the results are presented in figure 1
Summary
A category of non-toxic, biodegradable and low-cost polysaccharide, has been widely applied to many fields and attracts a great deal of attention as a potential alternative to the conventional petroleum-based materials [1,2,3,4]. To meet the requirements for the packaging materials, it is highly necessary to improve the hydrophobicity and strength of various forms of starch-based materials including films, foam and starch-coated papers [7,8,9]. It is commonly used to improve the water resistance and strength of starch-coated papers in various ways, including the addition of moisture proof agents or cross-linking agents in the starch solution, such as glutaraldehyde (GA), formaldehyde (FA), butanetetracarboxylic acid (BTCA), citric acid (CA), etc. It is commonly used to improve the water resistance and strength of starch-coated papers in various ways, including the addition of moisture proof agents or cross-linking agents in the starch solution, such as glutaraldehyde (GA), formaldehyde (FA), butanetetracarboxylic acid (BTCA), citric acid (CA), etc. [13,14,15,16]
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