Research progress in enhancing hydrophobicity of polysaccharide-based degradable film
Polysaccharide-based degradable packaging films are potential choices to replace traditional petroleum-based plastic film due to the characteristics of non-toxicity,environmental friendliness,and good mechanical strength.However,the hydrophilicity of most polysaccharides is strong,leading to weak water resistance property of films of them,hindering practical application.In this paper,the recent research progress in the enhancement of hydrophobic properties of polysaccharide-based degradable composite films was presented.According to chemically-modified methods of polysaccharides,the hydrophobic modification effect on typical chemically modified polysaccharide films was introduced,including modified-starch film,modified-konjac glucomannan film,and modified-chitosan film;from the viewpoint of physical blending,the mechanism of hydrophobic enhancement of composite film formed by polysaccharide and other natural components was summarized;from the perspective of multilayer composite,the effect of layer-by-layer self-assembly and electrospinning,and plasma technology on the hydrophobic effect of the polysaccharide-based composite film was explained.It is necessary to elucidate the formation mechanism of the hydrophobic structure of the modified film from the aspects of molecular assembly structure and assembly process of the modified film in the future,to provide theoretical guidance for stable production of the films.Also,the feasibility of simultaneously enhancing the hydrophobicity and mechanical properties of the polysaccharide-based degradable films by combining various film-producing technologies should be explored,which would improve the application effect and consumption experience of polysaccharide-based degradable film in packaging.
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