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compared with Figure 2c. Therefore, it can be noted that the
nanocomposites fabricated by the SOAM method showed better
MWNTs dispersion and stronger polymer-MWNTs interfacial force than
those obtained by means of solution blending and melt mixing,
respectively. Figure 2d shows a TEM micrograph of a nanocomposite
with 2 wt% MWNTs produced using the SOAM method. Individual
MWNTs were randomly dispersed within the PBS matrix, and are
oriented toward the ultratoming direction as well. Because they are
affected by a strong shear force during additional melt mixing, shorter
nanotubes can be seen in some locations.
3. 3. Thermal behavior
Figure 3 shows representative TGA thermograms of the PBS/MWNTs
nanocomposites prepared by the SOAM method. It is evident that the
thermal stability was remarkably enhanced with the addition of MWNTs.
This is attributed to not only the uniform dispersion of MWNTs within
the PBS matrix but also the excellent thermal property of the MWNTs
themselves. In case of 5 % weight loss, the degradation temperature of
all nanocomposites produced via the SOAM method exhibited an
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