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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of octadecylamine functionalization of carbon nanotubes on dispersion, polarity, and mechanical properties of CNT/HDPE nanocomposites

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de Menezes, B. R. C. [1] ; Ferreira, F. V. [2] ; Silva, B. C. [1] ; Simonetti, E. A. N. [3] ; Bastos, T. M. [1] ; Cividanes, L. S. [1] ; Thim, G. P. [1]
Total Authors: 7
[1] Inst Tecnol Aeronaut ITA, Div Ciencias Fundamentais, Praca Marechal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[2] Univ Campinas UNICAMP, Fac Engn Quim, Campinas, SP - Brazil
[3] Inst Fed Sao Paulo IFSP, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Materials Science; v. 53, n. 20, p. 14311-14327, OCT 2018.
Web of Science Citations: 12

Homogeneous dispersion of carbon nanotubes (CNTs) in polymers has significantly improved their processing and application as nanomaterials. Generally, CNTs tend to agglomerate due to their high aspect ratios and strong van der Waals interaction. Surface functionalization appears to be a solution to this problem. This study presents a controlled dispersion of carbon nanotubes in polyethylene through surface modification using a mixture of concentrated acid and octadecylamine (ODA). CNTs were characterized by Fourier transform infrared, Raman and X-ray photoelectron spectroscopy, and transmission electron microscopy. The results confirmed that carboxyl and alkane groups were successfully introduced on CNT surfaces. The acid- and amine-functionalized carbon nanotubes were dispersed in four solvents with different polarities (water, ethanol, acetone, and xylene) to correlate the degree of dispersion of CNT with their polarity. The results showed that CNT dispersion stability strongly depends on solvent and carbon nanotube polarities after the functionalization step. The nanohardness and tensile tests showed that the addition of CNTs, especially the functionalized with ODA, leaded the polymer harder, increasing its Young's modulus and tensile strength. However, its toughness and deformation capacity were reduced. The potential applications of CNT-based polymer nanocomposites broaden considerably due to the surface engineering of carbon nanotubes. (AU)

FAPESP's process: 14/17492-6 - Effect of CTN functionalization with alcenes of several sizes on the CNT/PEAD nanocomposites
Grantee:Gilmar Patrocínio Thim
Support type: Regular Research Grants
FAPESP's process: 16/09588-9 - Functionalization of cellulose nanocrystals to developing biodegradable nanocomposites PBAT/CNC
Grantee:Filipe Vargas Ferreira
Support type: Scholarships in Brazil - Doctorate