土壤填埋降解后丝素纤维的微观结构和力学性能

分析了丝素纤维在土壤中填埋降解后的形态结构、结晶结构、分子构象以及力学性能的变化,并与涤纶纤维进行对比分析。研究结果表明:经过2个月以上的填埋后,丝素纤维的表面出现了坑穴,且填埋时间越长坑穴的数量越多,尺寸也增大,6个月后纤维的强力和伸长都下降了90%左右,9个月时纤维已经完全降解;填埋降解后,丝素纤维的结晶度没有显著的变化,但分子的构象有向α螺旋和无规卷曲转化的趋势。

Microstructures and mechanical properties of silk fibroin fibers after soil-burial biodegradation

The silk fibroin fibers buried in soil for several months were measured and analyzed in surface shape,crystal structure,molecular conformation and mechanical properties,and compared with polyester fibers.The results revealed that there were some delves in the surface of silk fibroin fibers buried in soil for above two months,and the numbers and sizes of delves increased with burial time.After being buried in soil for 6 months,the strength and strain at break of silk fibers decreased to about 10% of a control sample′s,and the fibers were completely degraded when burial time was 9 months.The crystallinity of biodegraded silk in soil was almost unchanged,however,the molecules tended to beαhelix and random coil structures.