多糖基可降解膜的疏水性质强化研究进展

Research progress in enhancing hydrophobicity of polysaccharide-based degradable film

多糖基可降解膜因具备无毒、环境友好、力学强度较好等特点,是替换传统石油基塑料膜的潜在选择。但大多数多糖的亲水性较强,使其形成的薄膜耐水性较弱,不利于实际应用。展示了近年来多糖基可降解复合膜疏水性质强化的研究进展。基于多糖化学改性方法,介绍了常见多糖膜的疏水改性效果,包括改性淀粉膜、改性魔芋葡甘聚糖膜和改性壳聚糖膜;从物理共混的角度总结了多糖与其他天然成分复合成膜的疏水增强机理;从多层复合的角度说明了层层自组装、静电纺丝等离子体等技术对多糖基复合膜疏水效果的提升效果。建议今后从改性膜的分子组装结构及其组装过程等方面阐明改性膜的疏水结构形成机理,为其稳定生产提供理论指导。同时,探究结合多种成膜技术同步强化多糖基可降解膜的疏水和力学性能的可行性,提升多糖基可降解膜在包装上的应用效果与体验。

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 selfassembly 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 polysaccharidebased 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.