Hot Pressing Preparation and Properties of Chitosan/Deep Eutectic Solvent Composite Films

GAO Yuying; FAN Min; CHENG Xiaoxiao; LI Li

doi:10.19554/j.cnki.1001-3563.2025.15.010

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (15) : 93-99. DOI: 10.19554/j.cnki.1001-3563.2025.15.010

Special Topic on Sustainable Packaging Technology Innovation and Industrial Development

Hot Pressing Preparation and Properties of Chitosan/Deep Eutectic Solvent Composite Films

GAO Yuying, FAN Min, CHENG Xiaoxiao, LI Li^*

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Abstract

The work aims to investigate the effect of different DES on film properties by doping chitosan powder with different components of deep eutectic solvent (DES) and preparing heat-sealable chitosan films through hot pressing. Four DES, choline chloride/citric acid, choline chloride/lactic acid, betaine/citric acid, and betaine/lactic acid, were prepared, and four chitosan films were prepared by hot pressing after proportional blending of chitosan with each of the four types of DES. The effects of DES composition on film properties were evaluated in terms of heat sealing properties, mechanical properties, water barrier properties, and optical properties of the films. The properties of the films prepared from different DES and chitosan films varied greatly, with the citrate-based DES films exhibiting higher tensile strength (22.83 MPa) and heat sealing strength ((3.54±0.26)N/15 mm), while the lactate-based DES films were more flexible (elongation at break 75.30%), had higher light transmission, but had weak heat sealing properties. In conclusion, the components of DES affect the performance of the films, and the films prepared by hot pressing of choline chloride-citric acid DES with chitosan show better tensile properties and heat sealing properties, which provides a new strategy for the green and functional design of bio-based packaging materials.

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chitosan / deep eutectic solvent / hot pressing / heat sealing property

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GAO Yuying, FAN Min, CHENG Xiaoxiao, LI Li. Hot Pressing Preparation and Properties of Chitosan/Deep Eutectic Solvent Composite Films[J]. Packaging Engineering. 2025, 46(15): 93-99 https://doi.org/10.19554/j.cnki.1001-3563.2025.15.010

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