Multiwalled carbon nanotubes functionalized with 7-octenyltrichlorosilane and n-octyltrichlorosilane: dispersion in Sylgard^?184 silicone and Young¡¯s modulus

详细信息    查看全文

• 作者：Laurence Vast ; Luc Carpentier ; Fabrice Lallemand ; Jean-Fran?ois Colomer ; Gustaaf Van Tendeloo ; Antonio Fonseca ; J¨¢nos B. Nagy ; Zineb Mekhalif and Joseph Delhalle
• 刊名：Journal of Materials Science
• 出版年：2009
• 出版时间：July, 2009
• 年：2009
• 卷：44
• 期：13
• 页码：3476-3482
• 全文大小：520.8 KB

文摘

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.