Hemicellulose/chitosan based compound membrane with high flexibility and mechanical strength and preparation method thereof

Abstract

The invention discloses a method for preparing a hemicellulose / chitosan based compound membrane with high flexibility and mechanical strength. The method comprises the following steps: (1) dissolvingchitosan in an acetic acid solution, heating and stirring to prepare a chitosan solution; (2) dissolving hemicellulose in an acetic acid solution, heating and stirring to prepare a hemicellulose solution; (3) mixing the hemicellulose solution and the chitosan solution, and adding a cellulose nano-fiber solution; (4) adding plasticizer into the mixed solution, stirring the mixed solution at room temperature, centrifuging to remove insoluble impurities, performing ultrasonic degassing, and standing to obtain a compound membrane-forming solution; and (5) putting the membrane-forming solution in aculture dish, drying in a vacuum drying tank to form a membrane. The hemicellulose / chitosan based compound membrane has relatively high flexibility, relatively high tensile strength and relatively good oxygen resistance, is antibacterial and antioxidative, and has a relatively good application prospect in food package, oxidation resistance and other aspects.

Description

technical field

[0001] The invention relates to the technical field of biomass resource utilization and the field of polymer membrane materials, in particular to a hemicellulose / chitosan-based composite membrane with high flexibility and mechanical strength and a preparation method thereof. Background technique

[0002] Packaging materials are critical to extending the shelf life of foods, controlling moisture and gas exchange, and reducing the rate of oxidation reactions. Most of the packaging materials currently used are non-renewable resources, such as petroleum-based polymers, which not only cause waste of resources, but also bring serious environmental problems. Bio-based polymers are renewable, biodegradable and environmentally friendly, making them ideal materials to replace petroleum-based polymers. At present, the use of bio-based polymers such as polysaccharides, proteins, lipids, etc. to prepare packaging film materials is favored by people. Among various film-f...