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Materials 2016, 9(2), 68; doi:10.3390/ma9020068

Mechanical Strength Improvements of Carbon Nanotube Threads through Epoxy Cross-Linking

1
Department of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
2
Department of Chemical Engineering, Nanjing Polytechnic Institute, Nanjing 210048, China
3
Department of Biomedical, Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221, USA
4
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Changle Chen
Received: 23 October 2015 / Revised: 22 December 2015 / Accepted: 18 January 2016 / Published: 25 January 2016
View Full-Text   |   Download PDF [2190 KB, uploaded 25 January 2016]   |  

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 S·cm−1 for cross-linked thread, and 3984.26 S·cm−1 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). View Full-Text
Keywords: carbon nanotube thread; carbon nanotube fiber; high tensile strength; epoxy cross-linking; 4,4-methylenebis (N,N-diglycidylaniline) carbon nanotube thread; carbon nanotube fiber; high tensile strength; epoxy cross-linking; 4,4-methylenebis (N,N-diglycidylaniline)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, Q.; Alvarez, N.T.; Miller, P.; Malik, R.; Haase, M.R.; Schulz, M.; Shanov, V.; Zhu, X. Mechanical Strength Improvements of Carbon Nanotube Threads through Epoxy Cross-Linking. Materials 2016, 9, 68.

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