Publication details

Authors: Yu, Qingyue; Alvarez, Noe; Miller, Peter; Malik, Rachit; Haase, Mark; Schulz, Mark; Shanov, Vesselin; Zhu, Xinbao 
Title: Mechanical Strength Improvements of Carbon Nanotube Threads through Epoxy Cross-Linking 
Type: Journal Article 
Publisher: Materials 
Year: 2016 
Start Page: 68 
End Page:  
Abstract: Individual Carbon Nanotubes (CNTs) have a great mechanical strength that needs to be transferred into macroscopic fiber assemblies. One approach to improve the mechanical strength of the CNT assemblies is by creating covalent bonding among their individual CNT building blocks. Chemical cross-linking of multiwall CNTs (MWCNTs) within the fiber has significantly improved the strength of MWCNT thread. Results reported in this work show that the cross-linked thread had a tensile strength six times greater than the strength of its control counterpart, a pristine MWCNT thread (1192 MPa and 194 MPa, respectively). Additionally, electrical conductivity changes were observed, revealing 2123.40 Scm1 for cross-linked thread, and 3984.26 Scm1 for pristine CNT thread. Characterization suggests that the obtained high tensile strength is due to the cross-linking reaction of amine groups from ethylenediamine plasma-functionalized CNT with the epoxy groups of the cross-linking agent, 4,4-methylenebis(N,N-diglycidylaniline).