Preparation and characterization of polyvinyl alcohol/secondary collagen fiber gel membrane with excellent mechanical property

The reuse of leather waste is a global challenge because of the increase of leather products. In this paper, collagen fiber (CF) was extracted from leather waste and polyvinyl alcohol (PVA) gel membranes containing CF with high mechanical property are fabricated by freeze-thaw method. Results shows that the composite gel membrane maintains the helical structure of CF. The tensile strength of the PVA/3CF-FW increases to 58.5 MPa, while its elongation at break increases to 365%. The swelling ratio increases with the addition of CF, and the PVA/7CF composite gel membrane has the highest swelling ratio, which is 11.65. However, the crystallinity reduced with the addition of CF. Compared to the pure 24PVA gel membrane and the PVA/GA gel membrane, the PVA/CF composite gel membrane prepared by freeze-thaw method has a better mechanical property.