Biomimetic preparation method of high-strength regenerated silk protein fiber

Abstract

The invention discloses a biomimetic preparation method of a high-strength regenerated silk protein fiber. The method takes high crystallization degree, high strength, high modulus nano cellulose whiskers with a large length-diameter ratio to simulate the beta-fold microcrystal in the natural silk fiber, then mixes the nano cellulose whiskers with a regenerated silk fibroin solution, and finally prepares the high-strength regenerated silk protein fiber through a wet spinning method. The characteristic that a large amount of hydroxyl groups in the molecular chains of the rigid nano cellulose whiskers can form intermolecular hydrogen bonds with polar groups such as carboxyl groups, amino groups, and the like, in the molecular chains of silk protein is utilized to achieve the structural bionics of the regenerated silk protein fiber, and thus improves the mechanical properties of the regenerated silk protein fiber. The preparation method is simple, and does not pollute the environment. The mechanical properties of the obtained regenerated silk fiber are equal to or even better than those of natural silk, and the regenerated silk fiber has the similar micro-structure and configuration as the natural silk.

Description

technical field [0001] The invention belongs to the technical field of high-performance fibers and bionics, and in particular relates to a bionic preparation method of high-strength regenerated silk protein fibers. Background technique [0002] Natural mulberry silk is a natural fiber spun by silkworms with protein aqueous solution under normal temperature and pressure. This smart spinning process involves the self-assembly of silk protein molecules into linear aggregates to form a liquid crystal phase. When the shear-sensitive protein solution is subjected to critical stretching and shear stress, a conformational transition occurs, from random coils to Three-dimensional β-sheet structure and complete fibrosis. In silk protein, glycine (Gly), alanine (Ala) and serine (Ser) with smaller substituents are arranged in a relatively regular sequence (GAGAGS) according to a certain sequence structure. n Highly repetitive segments constitute the crystalline β-sheet structure. The...

AI Technical Summary

Problems solved by technology

However, in the artificial simulated spinning of regenerated silk fibers, the performance of regenerated fibers, especially its low mechanical strength, has always been a key issue that plagues researchers from all over the world.

[0004] Through the analysis of existing research, we are concerned that the decisive reason for the poor performance of regenerated silk protein fibers is that the regenerated fibers artificially spun have defects in the condensed state structure, and the crystallinity and orientation of the fibers are not high.

Images