A novel in-situ crosslinking wet spinning method for promoting the strength of CNC/alginate fiber

Abstract

Improving the uniformity of phase separation in wet spinning is crucial for enhancing fiber properties. Different from traditional wet spinning methods, in this approach, the calcium source is homogeneously dispersed in the alginate spinning solution as nano-calcium carbonate. The release of calcium ions and in-situ crosslinking are regulated by adjusting the pH of the coagulation bath, thereby enhancing crosslinking uniformity. Morphology and distribution of calcium ions analysis revealed that the radial structure of the in-situ crosslinking spinning fibers is denser and more uniform, with a higher calcium ion concentration indicating a stronger degree of crosslinking. Tensile tests demonstrated that the fracture strength of in-situ crosslinking spun fibers without drawing is twice than that of traditional wet spinning fibers. This method offers a novel approach for the fabrication of wet-spun fibers with a uniform radial structure and high strength.