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Chen, Xianhong; Chen, Xiaojin; Lin, Ming; Zhong, Wenbin; Chen, Xiaohua; Chen, Zhenhua
Macromolecular chemistry and physics, May 4, 2007, Letnik: 208, Številka: 9Journal Article
Treating MWCNTs with an acidic solution (concentrated H2SO4/HNO3; 3:1) and subsequently with succinic acid peroxide leads to MWCNTs functionalized with carboxyl groups on their sidewalls (or surfaces). These MWCNT‐COOH were converted to MWCNT‐COCl and further to MWCNT‐NH2. The PU was covalently coated onto the sidewalls (or surfaces) of the MWCNT by in situ polymerization of TDI under ultrasound in the presence of MWCNT‐NH2. The results show that PU is chemically tethered to the MWCNT sidewalls (or surfaces) via the ∼HNCONH∼ linkage, with a thickness in the range of approximately 2 to 5 nm, and the amount of grafted PU is about 34 wt.‐%.
