Abstract: Collagen/chitosan blended fiber was stretched under three conditions, and the hydrothermal property of the blended fiber was studied respectively. The influence of glutaraldehyde was analyzed by the IF-IR. The results showed that the best condition of after-treatment was in water vapor, and the acetalation

could increase fiber’s hydrothermal property obviously.

Key words: collagen; chitosan; after-treatment; hydrothermal propertiy