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Mechanical and electrical properties of thermochemically cross-linked polymer carbon nanotube fibers Part A Applied science and manufacturing

Park, Ok-Kyung, Lee, Wonki, Hwang, Jun Yeon, You, Nam-Ho, Jeong, Youngjin, Kim, Seung Min, Ku, Bon-Cheol
Composites 2016 v.91 pp. 222-228
Raman spectroscopy, X-ray photoelectron spectroscopy, carbon nanotubes, composite materials, crosslinking, electrical conductivity, modulus of elasticity, polymers, tensile strength, thermogravimetry, transmission electron microscopy
We report an effective post-treatment method to improve the mechanical and electrical properties of carbon nanotube fibers (CNTF) by using an aryl radical coupling reaction of polymers. The modified CNTF were analyzed using X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, thermogravimetric analysis (TGA) and transmission electron microscopy (TEM). The results demonstrated that chemical cross-links formed by Poly(p-iodostyrene) (PIS) inside the CNTF affected the mechanical and electrical properties. Compared with pristine CNTF, the cross-linked CNTF using PIS exhibited about 160%, 200% and 53% increased tensile strength (1.4N/tex), elastic modulus (103N/tex) and electrical conductivity (1480S/cm), respectively. This post-treatment method using polymer impregnation followed by thermochemical reaction may provide a general strategy for enhancing both mechanical and electrical properties of directly spun CNTFs.