Mechanically Reinforced Silkworm Silk Fiber by Hot Stretching

查看全文 作　　者：Haojie [1]Lu;Kailun [1]Xia;Muqiang [1]Jian;Xiaoping [1]Liang;Zhe [1]Yin;Mingchao [1]Zhang;Huimin [1]Wang;Haomin [1]Wang;Shuo [1]Li;Yingying [1]Zhang

机构地区：[1]Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education,Department of Chemistry,Tsinghua University,Beijing 100084,China

出　　处：《Research》索引2022年第3期,共10页

基　　金：the National Natural Science Foundation of China(52125201 and 21975141);the National Key Basic Research and Development Program(2020YFA0210702). 摘　　要：Silkworm silk,which is obtained from domesticated Bombyx mori(B.mori),can be produced in a large scale.However,the mechanical properties of silkworm silk are inferior to its counterpart,spider dragline silk.Therefore,researchers are continuously exploring approaches to reinforce silkworm silk.Herein,we report a facile and scalable hot stretching process to reinforce natural silk fibers obtained from silkworm cocoons.Experimental results show that the obtained hot-stretched silk fibers(HSSFs)retain the chemical components of the original silk fibers while being endowed with increasedβ-sheet nanocrystal content and crystalline orientation,leading to enhanced mechanical properties.Significantly,the average modulus of the HSSFs reaches 21:6±2:8 GPa,which is about twice that of pristine silkworm silk fibers(11:0±1:7 GPa).Besides,the tensile strength of the HSSFs reaches 0:77±0:13 GPa,which is also obviously higher than that of the pristine silk(0:56±0:08 GPa).The results show that the hot stretching treatment is effective and efficient for producing superstiff,strong,and tough silkworm silk fibers.We anticipate this approach may be also effective for reinforcing other natural or artificial polymer fibers or films containing abundant hydrogen bonds. 关键词：fibers STRETCHING TOUGH

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Mechanically Reinforced Silkworm Silk Fiber by Hot Stretching

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