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Title: Improving mechanical properties of carbon nanotube fibers through simultaneous solid-state cycloaddition and crosslinking

Individual carbon nanotubes (CNTs) exhibit exceptional mechanical properties. However, difficulties remain in fully realizing these properties in CNT macro-assemblies, because the weak inter-tube forces result in the CNTs sliding past one another. Here in this study, a simple solid-state reaction is presented that enhances the mechanical properties of carbon nanotube fibers (CNTFs) through simultaneous covalent functionalization and crosslinking. This is the first chemical crosslinking proposed without the involvement of a catalyst or byproducts. The specific tensile strength of CNTFs obtained from the treatment employing a benzocyclobutene-based polymer is improved by 40%. Such improvement can be attributed to a reduced number of voids, impregnation of the polymer, and the formation of covalent crosslinks. This methodology is confirmed using both multiwalled nanotube (MWNT) powders and CNTFs. Thermogravimetric analysis, differential scanning calorimetry, x-ray photoelectron spectroscopy, and transmission electron microscopy of the treated MWNT powders confirm the covalent functionalization and formation of inter-tube crosslinks. This simple one-step reaction can be applied to industrial-scale production of high-strength CNTFs.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [2] ;  [1] ;  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry; Univ. of Sao Paulo (Brazil). Inst. for Advanced Studies (IEAV/DCTA)
  5. Univ. of Texas-Dallas, Richardson, TX (United States). Dept. of Chemistry and Biochemistry
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nanotechnology
Additional Journal Information:
Journal Volume: 28; Journal Issue: 14; Journal ID: ISSN 0957-4484
Publisher:
IOP Publishing
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; carbon nanotube fiber; one-step crosslinking; chemical post-treatment
OSTI Identifier:
1349602

Lu, Xinyi, Hiremath, Nitilaksha, Hong, Kunlun, Evora, Maria C., Ranson, Victoria H., Naskar, Amit K., Bhat, Gajanan S., Kang, Nam-Goo, and Mays, Jimmy W.. Improving mechanical properties of carbon nanotube fibers through simultaneous solid-state cycloaddition and crosslinking. United States: N. p., Web. doi:10.1088/1361-6528/aa6223.
Lu, Xinyi, Hiremath, Nitilaksha, Hong, Kunlun, Evora, Maria C., Ranson, Victoria H., Naskar, Amit K., Bhat, Gajanan S., Kang, Nam-Goo, & Mays, Jimmy W.. Improving mechanical properties of carbon nanotube fibers through simultaneous solid-state cycloaddition and crosslinking. United States. doi:10.1088/1361-6528/aa6223.
Lu, Xinyi, Hiremath, Nitilaksha, Hong, Kunlun, Evora, Maria C., Ranson, Victoria H., Naskar, Amit K., Bhat, Gajanan S., Kang, Nam-Goo, and Mays, Jimmy W.. 2017. "Improving mechanical properties of carbon nanotube fibers through simultaneous solid-state cycloaddition and crosslinking". United States. doi:10.1088/1361-6528/aa6223. https://www.osti.gov/servlets/purl/1349602.
@article{osti_1349602,
title = {Improving mechanical properties of carbon nanotube fibers through simultaneous solid-state cycloaddition and crosslinking},
author = {Lu, Xinyi and Hiremath, Nitilaksha and Hong, Kunlun and Evora, Maria C. and Ranson, Victoria H. and Naskar, Amit K. and Bhat, Gajanan S. and Kang, Nam-Goo and Mays, Jimmy W.},
abstractNote = {Individual carbon nanotubes (CNTs) exhibit exceptional mechanical properties. However, difficulties remain in fully realizing these properties in CNT macro-assemblies, because the weak inter-tube forces result in the CNTs sliding past one another. Here in this study, a simple solid-state reaction is presented that enhances the mechanical properties of carbon nanotube fibers (CNTFs) through simultaneous covalent functionalization and crosslinking. This is the first chemical crosslinking proposed without the involvement of a catalyst or byproducts. The specific tensile strength of CNTFs obtained from the treatment employing a benzocyclobutene-based polymer is improved by 40%. Such improvement can be attributed to a reduced number of voids, impregnation of the polymer, and the formation of covalent crosslinks. This methodology is confirmed using both multiwalled nanotube (MWNT) powders and CNTFs. Thermogravimetric analysis, differential scanning calorimetry, x-ray photoelectron spectroscopy, and transmission electron microscopy of the treated MWNT powders confirm the covalent functionalization and formation of inter-tube crosslinks. This simple one-step reaction can be applied to industrial-scale production of high-strength CNTFs.},
doi = {10.1088/1361-6528/aa6223},
journal = {Nanotechnology},
number = 14,
volume = 28,
place = {United States},
year = {2017},
month = {3}
}