Why should silk fibroin be modified

Although silk fibroin has many excellent performances, because the silk fibroin molecule contains a certain amount of hydroxyphenol groups and other structures, it is easy to absorb ultraviolet light and denature. Under ultraviolet light, the amino acid composition is cracked and the whiteness is obvious. Decrease, with the increase of the irradiation time, the yellowing degree of silk fibroin also increases, especially in the presence of water, the yellowing is more serious. The mechanical properties and thermal properties are also greatly reduced, which has a great impact on its performance, and silk fibroin is difficult to dye and easy to fade. In order to improve the defects, it must be modified. The modification can be done by biological genetic methods. To improve the species of silkworms, chemical and physical methods can also be used to improve them, usually chemical modification and polymer blending.