Multiwalled carbon nanotubes functionalized with 7-octenyltrichlorosilane and n-octyltrichlorosilane: Dispersion in Sylgard®184 silicone and Young's modulus

Journal of Materials Science (Impact Factor: 2.37). 07/2009; 44(13):3476-3482. DOI: 10.1007/s10853-009-3464-1


Sylgard®184/multiwalled carbon nanotube (MWNT) composites have been prepared by in situ polymerization using purified and functionalized
multiwalled carbon nanotubes (f-MWNTs) as fillers. Surface modification of the MWNTs has been carried out by silanization
with 7-octenyltrichlorosilane (7OTCS) and n-octyltrichlorosilane (nOTCS). The modification and dispersion of the carbon nanotubes in composites were characterized by X-ray photoelectron spectroscopy
(XPS), transmission electron spectroscopy (TEM), and high-resolution transmission electron spectroscopy (HRTEM). Young’s modulus
results were derived from indentation testing. It is shown that the terminal-vinyl group of 7OTCS molecules plays an essential
role for both the dispersion of the f-MWNTs in the composite and its mechanical properties. At loading as low as 0.2wt%,
the Young’s modulus is shown to increase up to 50%. This is interpreted as resulting from a combination of the good compatibility
in the forming silicone matrix of the MWNTs coated with a siloxane network, on the one hand, and the covalent links created
between the terminal-vinyl groups and the host matrix in formation, on the other hand.

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Available from: Luc Carpentier, Apr 01, 2014
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    • "After silane functionalization, both conditions were improved by the attachment of silane molecules onto CNTs surface. Vast et al, 2009, used two types of silane: 7-OTS and n-OTCS, which differ only by the nature of their end groups. These were used in order to compare dispersion of purified and silanized MWNTs in a thermally curable silicone rubber: Sylgard®184 and the effect on the Young's modulus. "

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