| Finishing of PET fabric with silk fibroin (SF) can combine the comfort and good affinity on the human body of silk and high strength, high flexibility of PET. This is of great significant for naturalizing synthetic fibers.With fusing of polyester-polyether finishing agent, active groups were introduced into the PET fabric. Silk fibroin was crosslinked to the PET with the crosslinker EH and Nipuwei. No matter which method was used, impregnation or baking, the weight of fabric didn't change before and after the crosslinking. Silk fibroin wasn't crosslinked to the fabric owing to the lack of active groups of the finishing agent.The inclusion compounds ofβ-cyclodextrin (β-CD) and silk peptide (SP) were grafted onto PET fibers by the intermediate of citric acid that played the role of crosslinking agents. Inclusion process enhanced the absorption of SP in the ultraviolet region, and increased with the CD concentration increasing. It showed that in acid medium, strong Coulomb attraction occurred between silk peptide andβ-cyclodextrin cavity with high electron density as well as a strong hydrophobic interaction that enhanced the electron mobility of silk peptide, resulting in a hyperchromic effect. The effect of finishing parameters were investigated and the optimum conditions were obtained as follows:SP 20 g/L,β-CD 50 g/L, citric acid 75 g/L, sodium hypophosphite 15 g/L, pH 2, curing temperature 170℃, curing time 5 min. The weight gain reached 10.56% after finishing, while the fabric yellowed severely, which might be caused by the dehydration of citric acid and the yellowing of silk fibroin in high cuing temperature. Besides, the hydrophilic of the fabric did not improve forβ-cyclodextrin's covering the fabric surface.The fabrics were coated with silk fibroin pretreated by tin tetrachloride, tannin, hydroxyapatite (HA) respectively with the bonding of adhesives. After the weighting finishing with tin tetrachloride, silk peptide was coated on PET. The optimum is:SP 25 g/L, SnCl4 25 g/L, pH 4. When pH= 4, Sn4+ mostly hydrolyzed and formed Sn(OH)4 gel and the viscosity of the solution didn't increased too much. After the weighting finishing with tannin, SP was coated on PET. The weight gain didn't change too much when amount of tannic and SP changed. At the same time, tannin is easy to precipitate from the solution owing to its weak solubility. And its intrinsic color would give an impact to the color of the finished fabric, so this approach is not feasible. Fibroin and hydroxyapatite composite lead to changes in its structure, with the formation ofβ-sheet structures. Interaction occurred between inorganic and organic phases. During finishing of PET with adhesive, it was found that the temperature and the ratio of SF/HA played more important role than pH and time. For adhesive XJ, the weight gain rate could reach 11.14% when the temperature is 60℃, SF/HA=3/6. Mechanical properties of the fabric treated changed a little while the moisture regain decreased. After dyeing by acid dye, the K/S values were low, indicating that the surface of the fabric treated was covered by a small amount of SF. Also several different types of adhesives were compared. Two kinds of adhesive FS showed that their properties are similar. When they were used in finishing, the weight gain rate didn't change with the temperature but increased a little with the ratio SF/HA. The weight gain rate would reach its maximum when the fabric was treated with adhesive ESH or PAD at 40℃. For adhesive PAD, its weight gain rate reached the maximum 15.12%.
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