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Citation: LI Juan, FANG Zheng-ping, WANG Jian-guo, GU Aijuan, TONG Li-fang, LIU Fu. Microstructure Transformation of Multi-walled Carbon Nanotubes during Diamine Grafting Process[J]. Acta Physico-Chimica Sinica, ;2005, 21(11): 1244-1248. doi: 10.3866/PKU.WHXB20051110 shu

Microstructure Transformation of Multi-walled Carbon Nanotubes during Diamine Grafting Process

1.
Institute of Polymer Composites, Zhejiang University, Hangzhou 310027； Institute of Material Physics and Microstructure, Zhejiang University, Hangzhou 310027

Received Date: 24 March 2005
Available Online: 15 November 2005

1,6-hexamethylene diamine (HMD) was grafted onto multi-walled carbon nanotubes (MWNTs) via acid-thionyl chloride route. The characterization of MWNTs was carried out by Fourier transform infrared spectrum, thermal gravimetric analysis, field emission scanning electron microscopy and Raman spectrum. The results show that HMD is covalently bonded on the MWNTs after activating by thionyl chloride. During this process, the compact stacking microstructure induced by acid treatment is deaggregated. The apparent specific volume of functionalized MWNTs is even larger than that of the pristine MWNTs. The chemical processing of MWNTs modification was analyzed theoretically in detail and the mechanism of microstructure transformation was speculated. It is proposed that HMD molecules inserted in different carbon nanotubes and break the hydrogen bond structure formed in acidification process. Therefore the dense structure derived from acidification is modified, leading to a less compact stacking and larger apparent specific volume of MWNTs.
- Multi-walled carbon nanotubes;Amino-functionalization; Microstructure;Field emission scanning electron microscopy
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