Preparation and properties of transparent, waterproof, and antibacterial composite film materials

Transparent polymer materials, such as plastics, have become widely used in the packaging industry due to their excellent properties. However, their nondegradability has led to a significant environmental issue known as “white pollution.” To address this issue, a transparent antibacterial film material was prepared using carboxymethyl cellulose and carboxymethyl chitosan as raw materials through an acid‐assisted freeze–thaw strategy. The material exhibits optical transmittance exceeding 90% and a tensile strength of up to 124.1 MPa. Meanwhile, this material demonstrated excellent waterproof performance as well as antibacterial activity to Staphylococcus aureus and Escherichia coli. Therefore, this film material holds promising potential for development in antibacterial food packaging. By utilizing carboxymethyl cellulose and carboxymethyl chitosan, the transparent antibacterial film material was prepared using an acid‐assisted freeze–thaw strategy. The optical transmittance exceeds 90%, and the tensile strength can reach up to 124.1 MPa. Furthermore, this material exhibits excellent waterproof performance and displays antibacterial activity against Staphylococcus aureus and Escherichia coli. Consequently, this film material holds significant potential for development in antibacterial food packaging.