Journal
MATERIALS
Volume 9, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/ma9020068
Keywords
carbon nanotube thread; carbon nanotube fiber; high tensile strength; epoxy cross-linking; 4; 4-methylenebis (N; N-diglycidylaniline)
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Funding
- Chinese Jiangsu Overseas Research & Training Program for University Prominent Young & Middle-aged Teacher and President
- Innovation Project of Chinese Jiangsu Province
- National Science Foundation [CMMI-0727250, SNM-1120382, ERC-0812348]
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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).
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