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Significantly Enhanced Mechanical Strength by the Hollow Structure of Conductive Stretchable Silver Nanoflower‐Polyurethane Fibers
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-08-07 , DOI: 10.1002/adem.202000674 Seonghyun Bae 1 , C. Muhammed Ajmal 1 , Yoojin Lee 1 , Seunghyun Baik 1
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-08-07 , DOI: 10.1002/adem.202000674 Seonghyun Bae 1 , C. Muhammed Ajmal 1 , Yoojin Lee 1 , Seunghyun Baik 1
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The conductive stretchable nanocomposite fibers, synthesized by the wet spinning technology, are typically composed of conductive nanofillers and polymer matrix to achieve both high electrical conductivity and stretchability. However, the inclusion of nanofillers blocks the solvent extraction passages, resulting in large voids (>3 μm2) and decreasing mechanical strength. Herein, hollow fibers synthesized using a coaxial spinneret with double concentric needles are presented. The dope mixture of silver nanoflower‐shaped particles (AgNFPs, 36 vol%), polyurethane (PU), and dimethylformamide is extruded through the outer nozzle, whereas the coagulant is supplied to the inner nozzle. This significantly shortens the maximum solvent diffusion length from 127.5 μm of solid fibers to 18.5 μm of hollow fibers. Resultantly, the large void becomes negligible in the hollow AgNFP‐PU fiber, and the mechanical strength increases by 100% (29 MPa) compared with that of the solid AgNFP‐PU fiber (14.5 MPa). The initial electrical conductivity (≈10 990 S cm−1) and rupture strain (≈120%) of both hollow and solid fibers are similar. Furthermore, the change in resistance decreases by 50% at 50% strain when the inner space is filled with liquid metal. This demonstrates that versatile functionality can be implemented by filling the gap with functional materials.
中文翻译：
导电可拉伸银纳米花聚氨酯纤维的空心结构显着提高了机械强度
通过湿纺技术合成的导电可拉伸纳米复合纤维通常由导电纳米填料和聚合物基质组成，以实现高电导率和可拉伸性。然而，包含纳米填料块的溶剂提取通道，从而导致大的空隙（> 3微米2）并降低机械强度。在此，提出了使用具有双同心针的同轴喷丝头合成的中空纤维。纳米花状银颗粒（AgNFP，36％（体积）），聚氨酯（PU）和二甲基甲酰胺的涂料混合物通过外喷嘴挤出，而凝结剂则供给内喷嘴。这将最大溶剂扩散长度从实心纤维的127.5μm缩短到中空纤维的18.5μm，明显缩短。结果，中空的AgNFP-PU纤维中的大空隙可以忽略不计，与固态的AgNFP-PU纤维（14.5 MPa）相比，机械强度提高了100％（29 MPa）。初始电导率（≈10990 S cm -1）和中空纤维与实心纤维的断裂应变（≈120％）相似。此外，当内部空间充满液态金属时，在50％应变下，电阻变化降低了50％。这表明可以通过填充功能材料来实现通用功能。
更新日期：2020-08-07
中文翻译：
导电可拉伸银纳米花聚氨酯纤维的空心结构显着提高了机械强度
通过湿纺技术合成的导电可拉伸纳米复合纤维通常由导电纳米填料和聚合物基质组成，以实现高电导率和可拉伸性。然而，包含纳米填料块的溶剂提取通道，从而导致大的空隙（> 3微米2）并降低机械强度。在此，提出了使用具有双同心针的同轴喷丝头合成的中空纤维。纳米花状银颗粒（AgNFP，36％（体积）），聚氨酯（PU）和二甲基甲酰胺的涂料混合物通过外喷嘴挤出，而凝结剂则供给内喷嘴。这将最大溶剂扩散长度从实心纤维的127.5μm缩短到中空纤维的18.5μm，明显缩短。结果，中空的AgNFP-PU纤维中的大空隙可以忽略不计，与固态的AgNFP-PU纤维（14.5 MPa）相比，机械强度提高了100％（29 MPa）。初始电导率（≈10990 S cm -1）和中空纤维与实心纤维的断裂应变（≈120％）相似。此外，当内部空间充满液态金属时，在50％应变下，电阻变化降低了50％。这表明可以通过填充功能材料来实现通用功能。
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