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matrix. However, CNTs are strongly affected by van der Waals force
due to their small size and large surface area. These forces give rise to
the formation of aggregates, which in turn, make dispersion of CNTs in
the polymers difficult. In order to attain an efficient dispersion of CNTs
by the physical approach, ultrasound can be applied to a dispersion of
CNTs. [9] In addition, chemical methods such as covalent attachment
involving the introduction of a chemical group to the nanotube wall,
and non-covalent adsorption methods have been employed in order to
provide chemical compatibility with the polymers, and dissolution of
CNTs in organic solvents. [10-12]
Generally, the following three methods for the preparation of
polymer-CNTs nanocomposite are employed to promote the dispersion
of controlled CNTs throughout the polymer matrix: (i) solution blending,
a method for precipitating or casting a polymer-CNTs solution
dissolved in a solvent, [13,14] (ii) melt mixing, which requires high
temperature and shear force according to the polymer species in the
mixer without a solvent and (iii) in-situ polymerization, a method to
polymerize the monomer in the presence of the dispersed-CNTs. This
last approach has outstanding potential which can include covalent
bonding between the polymer matrix and modified-CNTs. [16,17]
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