Simultaneously enhanced tenacity, rupture work, and thermal conductivity of carbon nanotube fibers by raising effective tube portion.


Type
Article
Change log
Abstract

Although individual carbon nanotubes (CNTs) are superior to polymer chains, the mechanical and thermal properties of CNT fibers (CNTFs) remain inferior to synthetic fibers because of the failure of embedding CNTs effectively in superstructures. Conventional techniques resulted in a mild improvement of target properties while degrading others. Here, a double-drawing technique is developed to rearrange the constituent CNTs. Consequently, the mechanical and thermal properties of the resulting CNTFs can simultaneously reach their highest performances with specific strength ~3.30 N tex-1 (4.60 GPa), work of rupture ~70 J g-1, and thermal conductivity ~354 W m-1 K-1 despite starting from low-crystallinity materials (IG:ID ~ 5). The processed CNTFs are more versatile than comparable carbon fiber, Zylon and Dyneema. On the basis of evidence of load transfer efficiency on individual CNTs measured with in situ stretching Raman, we find that the main contributors to property enhancements are the increasing of the effective tube contribution.

Description
Keywords
40 Engineering, 4016 Materials Engineering, 4001 Aerospace Engineering, 4018 Nanotechnology, Bioengineering
Journal Title
Sci Adv
Conference Name
Journal ISSN
2375-2548
2375-2548
Volume Title
8
Publisher
American Association for the Advancement of Science (AAAS)
Sponsorship
EPSRC (EP/M015211/1)
Engineering and Physical Sciences Research Council (EP/M015211/1)