Investigation of Interfacial Interaction and Microstructure for Epozy/CNTs Nanocomposites by PALS
Epoxy resin nanocomposites with different content of multi-walled carbon nanotubes (MWNTs) were prepared. The interaction between MWNTs and epoxy resin matrix and microstructure were systematically investigated by Fourier transform infrared (FTIR) spectra, transmission electron microscopy, scanning electron microscopy and the positron annihilation technology (PAT) respectively. FTIR spectrum revealed that two kinds of hydrogen bonds exist on the interface for the nanocomposites modified by amine, including one between epoxy group on side chain and N-H group, and the other between epoxy group on alicycle and N-H group. Positron annihilation lifetime spectroscopy (PALS) was firstly employed to characterize the microstructure of Epoxy/MWNTs composites, according to the finite-term positron lifetime analysis and the variation of the free volume size as a function of temperature, the subtransition and glass transition were determined. With the increasing of MWNTs weight content, shifts of structure transition temperatures of composites were observed. It is very interested that the continuous lifetime analysis reveals the existence of two long-lived lifetime components above glass transition temperature, which may be attributed to the formation of the local ordered regions related to the packing density of chains.
carbon nanotubes nanomaterials epozy resin glass transition interfacial interaction positron annihilation
Wei Zhou Yuchan Zhu Junjun Wang Ning Qi Bo Wang Yaping Zheng
Department of Physics,Wuhan University,Wuhan 430072,China Department of Chemical Engineering,Northwestern Polytechnical University,Xian 710072,China
国际会议
第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)
武汉
英文
38
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）