Performance testing and analysis of silk glue protein modified polyacrylonitrile fiber
Acrylic is modified with silk gum protein to obtain fibers with good mechanical properties and improved moisture absorption.The effect on the mechanical properties of the fibers is investigated by varying the tensile multiplier.By changing the drying densification process,the change of internal crystallinity of the fiber and the effect of this change on the mechanical properties are investigated.The results show that as the total stretching ratio increases,the fiber orientation degree increases,and the mechanical properties also improve;When the total multiple of two stretching cycles is 6.5 times,the fiber fracture strength obtained is the best,which is 3.87 cN/dtex;The fiber performance is optimal when the drying and densification temperature is 120 ℃ and the densification time is 110 s;If the densification temperature is too high,the crystal orientation of the fibers decreases;Under the optimal densification conditions,the fracture strength of the fiber is 3.8 cN/dtex;The moisture regain of silk fibroin modified polyacrylonitrile fibers is 6.9％,which is 3.5 times higher than that of conventional acrylic fibers.
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