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A process for surface modification of LDPE films has been developed by employing chitosan (CS), alkyl ketene dimer (AKD), and glutaraldehyde (GA). Surface roughness and polar reactive groups were generated on the film surfaces by etching with chromic acid at 30 min. The polar groups interact/react with CS/AKD/GA, forming a highly stable coating layer. At optimum conditions (24 µm coating thickness), the film’s antibacterial properties (99.9% inhibition) and hydrophobicity are drastically enhanced. The film’s mechanical and optical properties and crystalline characteristics remain unchanged. The facile process has a high potential for fabricating functional films in food packaging and greenhouse applications.

Surface modifications of low-density polyethylene films with hydrophobic and antibacterial properties by chitosan-based materials