Preparation of high-strength and highly UV-resistant regenerated cellulose films via dual crosslinking method
People have been committed to the development of environmentally friendly films made of natural polymers and renewable resources,especially multi-functional films with excellent mechanical properties and optical properties.Cellulose is an inexhaustible raw material with hydrophilic properties,biocompatibility and biodegradability.It is an ideal choice for preparing environmentally friendly films.A green route was designed to prepare strong regenerated cellulose membranes(RC).The regenerated cellulose films were prepared by physical and chemical cross-linking,and the effects of different cross-linking methods on the mechanical properties of the films were studied systematically.The microstructure and morphology of the crosslinked RC films showed that the compactness of the crosslinked RC films was significantly improved,the defects were reduced,and the intermolecular interaction was enhanced.The mechanical properties of the regenerated cellulose film prepared by using cellulose nanospheres(PCNS)as the physical crosslinking agent increased at first and then decreased with the increase of the amount of PCNS.When the amount of PCNS was 5%,the tensile strength of the film reached a maximum of 38.1 MPa.When folic acid(FA)was used as a chemical crosslinking agent to prepare the regenerated cellulose film,it was found that the tensile strength of the film could also be significantly enhanced,and the tensile strength of the film was the highest when the FA content was 10%,which was 42.7 MPa.On this basis,the regenerated cellulose film prepared with two crosslinking agents can improve the tensile strength of the film to a greater extent,with the tensile strength reaching 45.3 MPa and the elongation at break reaching 16.4% .In addition,it was found that the introduction of FA made the film have good UV resistance.
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