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Preparation and electrical properties of chemically functionalized carbon nanotube/polymer composites pp.705-726 $100.00
Authors:  (Qun Li, Qingzhong Xue, Department of Materials and Chemical Engineering, Taishan University, People’s Republic of China, and others)
Abstract:
Since the discovery of the carbon nanotubes (CNTs) by Iijima in 1991, CNTs have
been widely studied in the past few years because of their extraordinary electrical,
thermal and mechanical properties. They have been pursued extensively to enhance the
electrical properties of the polymer matrix by using CNTs as the nanofibers. However,
owing to the high surface energy, the dispersion of the CNTs in polymer matrix becomes
the very difficult problem. In order to solve this problem and make use of the unique
properties of the CNTs, the chemical functionalization has been introduced in recent
years. The interfacial characteristics between the CNTs and the polymer matrix could
also be changed by the chemical functionalizaton.
In this chapter, we summarize the preparation method of CNT chemical
functionalization. And the electrical properties of the chemically functionalizd
CNT/polymer composites were investigated. Firstly, the noncovalent functionalizations
and the covalent functionalizations, for instance, the carboxylic, amino, fluorin, ester
functionalizations, were summarized. Not only the solubility and compatibility of the
CNTs, but also the interfacial characteristics between the CNTs and the polymer matrix
could be improved by the chemical functionalizations. Secondly, the electrical properties
of the chemically functionalized multiwalled carbon nanotube/poly(vinylidene fluoride)
(MWCNT/PVDF) composites were investigated. The electrical conductivity of the
polymer composites increases remarkably after the MWCNT concentration approaches
the percolation thresholds. And the dielectric constant of the polymer composites also
increases very much. However, the electrical conductivity and the dielectric constant of
the chemically functionalized MWCNT/PVDF composites are different from the pristine
MWCNT/PVDF composites, which can be attributed to the interface effect between the
MWCNTs and the polymer. 


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Preparation and electrical properties of chemically functionalized carbon nanotube/polymer composites pp.705-726