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Mechanisms of single-walled carbon nanotube network formation and its configuration in polymer-based nanocomposites
ID Oseli, Alen (Author), ID Vesel, Alenka (Author), ID Žagar, Ema (Author), ID Slemenik Perše, Lidija (Author)

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Abstract
The reinforcing and conductive performance of carbon nanotube polymer-based nanocomposites depends on the established network and its configuration. Within this study, we report on the underlying mechanisms of such network formation utilizing single-walled carbon nanotubes (SWCNTs) in low- and high-density polyethylene matrices. Mechanisms were theoretically evaluated through Doi-Edwards theory and experimentally confirmed through plasma etching coupled with electron microscopy as well as rheological flow tests. Results showed that the established network is constructed from SWCNT bundles, which geometrically entangle at a critical volume fraction [phi]v,crit (number of rods: [beta approximately equal to] 30). Below [phi]v,crit, the bundles behave as individual units and may align in the flow direction. Above [phi]v,crit, the rotation of bundles is constrained by neighboring units, leading to a random network configuration. Moreover, the theory successfully explains SWCNT bundle behavior as a Brownian entity and predicts network formation through diminishing thermo- and hydro-dynamically driven diffusion, which can be manipulated during the production to enhance reinforcing/conductive functionality of such materials.

Language:English
Keywords:nanocomposites, single-walled carbon nanotubes, network formation, molecular dynamics, Doi-Edwards theory
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Submitted for review:04.03.2021
Publication date:13.04.2021
Year:2021
Number of pages:Str. 3334-3346
Numbering:Vol. 54, iss. 7
PID:20.500.12556/RUL-126692 This link opens in a new window
UDC:620.168(045)
ISSN on article:0024-9297
DOI:10.1021/acs.macromol.0c02763 This link opens in a new window
COBISS.SI-ID:58206467 This link opens in a new window
Publication date in RUL:04.05.2021
Views:593
Downloads:122
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Record is a part of a journal

Title:Macromolecules
Shortened title:Macromolecules
Publisher:American Chemical Society
ISSN:0024-9297
COBISS.SI-ID:25886464 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:13.04.2021

Secondary language

Language:Slovenian
Keywords:nanokompoziti, eno-stenske ogljikove nano-cevke, nastanek omrežja, molekularna dinamika, Doi-Edwards teorija

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0264
Name:Trajnostni Polimerni materiali in Tehnologije

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