Multiwalled carbon nanotubes functionalized with 7-octenyltrichlorosilane and n-octyltrichlorosilane: dispersion in Sylgard®184 silicone and Young’s modulus
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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). 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 0.2 wt%, 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.
KeywordsHRTEM PDMS Silicone Rubber Host Matrix Trichlorosilanes
This study was supported through BINANOCO project (02/1/5221) of the Walloon Region and the “Belgian National Interuniversity Research Program on quantum size effects in nanostructure materials” (IUAP P5/01). J.-F.·C. is supported by the Belgian FNRS in his capacity as a postdoctoral researcher. The authors are grateful to Dr. F. De Buyl (Dow Corning, Belgium) for supplying Sylgard®184 and to Drs A. Destrée and N. Moreau for providing the raw CNTs used in this study.
- 10.Alexandre M, Dubois P, Devalckenaere M, Claes M (2007) Patent WO 2007048208Google Scholar