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Title
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Multiwalled carbon nanotubes functionalized with 7-octenyltrichlorosilane and **n**-octyltrichlorosilane: dispersion in Sylgard®184 silicone and Youngs modulus
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Author
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Abstract
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| 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). Youngs 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 0.2 wt%, the Youngs 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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Language
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English
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Source (journal)
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Journal of materials science. - London
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Publication
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London
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2009
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ISSN
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0022-2461
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Volume/pages
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44
:13
(2009)
, p. 3476-3482
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ISI
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000267153200022
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Full text (Publisher's DOI)
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