Performance Research and Characterization of UV-shielding Alginate Films Crosslinked with Fe³⁺ and H⁺

Taken sodium alginate as raw material, ion-bonded UV-resistant fiber film was prepared in this subject. The stability of the aqueous solution of the fiber membrane, the stability of ultraviolet radiation, and the thermal stability were preliminary analyzed. The scanning electron microscope (SEM), infrared spectroscopy (ATR-FTIR), and XRD were used to analyze the microstructure of the fiber membrane. The results showed that when the cross-linking conditions were 0.6% FeCl₃ and 0.4% HCl complex solution for 15 min, the comprehensive performance of Fe³⁺-H⁺ alginate fiber membrane was the best, that is, the long-wave ultraviolet transmittance was 2.92%, the tensile strength was up to 33.75 MPa, and the elongation at break rate was good at 19.54%. The Fe³⁺-H⁺ alginate fiber membrane had high crosslink densities, the internal bonding was close and the stability was good, which would provide a valuable lesson for the research and development of UV-resistant fiber materials.